This will create a calendar button for matches in "more matches" google result

GoogleSportsCalendar.js

// ==UserScript==
// @name         Google Sports Calendar
// @version      1.0.0
// @author       gonza7aav
// @match        https://www.google.com/*
// @grant        none
// @run-at       context-menu
// ==/UserScript==

(function() {
    'use strict';

    const TEAM_NAME_FIXES = new Map([
      ['Bayern', 'Bayern Munich'],
      ['Dortmund', 'Borussia Dortmund'],
      ['Instituto ACC', 'Instituto'],
      ['Leverkusen', 'Bayer 04 Leverkusen'],
      ['Man City', 'Manchester City'],
      ['Man United', 'Manchester United'],

      ['Belgium', 'Bélgica'],
      ['Brazil', 'Brasil'],
      ['Cameroon', 'Camerún'],
      ['Croatia', 'Croacia'],
      ['Czechia', 'Rep. Checa'],
      ['Denmark', 'Dinamarca'],
      ['England', 'Inglaterra'],
      ['France', 'Francia'],
      ['Germany', 'Alemania'],
      ['Italy', 'Italia'],
      ['Hungary', 'Hungría'],
      ['Japan', 'Japón'],
      ['Mexico', 'México'],
      ['Morocco', 'Marruecos'],
      ['Netherlands', 'Países Bajos'],
      ['Panama', 'Panamá'],
      ['Peru', 'Perú'],
      ['Poland', 'Polonia'],
      ['Romania', 'Rumania'],
      ['Saudi Arabia', 'Arabia Saudita'],
      ['Scotland', 'Escocia'],
      ['Slovakia', 'Eslovaquia'],
      ['Slovenia', 'Eslovenia'],
      ['South Africa', 'Sudáfrica'],
      ['South Korea', 'Corea del Sur'],
      ['Spain', 'España'],
      ['Sweden', 'Suecia'],
      ['Switzerland', 'Suiza'],
      ['Tunisia', 'Túnez'],
      ['Türkiye', 'Turquía'],
      ['Ukraine', 'Ucrania'],
      ['United Arab Emirates', 'Emiratos Arabes'],
      ['Wales', 'Gales'],
    ]);

    const NATIONAL_FLAGS = new Map([
      ['Albania', '🇦🇱'],
      ['Alemania', '🇩🇪'],
      ['Arabia Saudita', '🇸🇦'],
      ['Argentina', '🇦🇷'],
      ['Australia', '🇦🇺'],
      ['Austria', '🇦🇹'],
      ['Bélgica', '🇧🇪'],
      ['Bolivia', '🇧🇴'],
      ['Brasil', '🇧🇷'],
      ['Camerún', '🇨🇲'],
      ['Canada', '🇨🇦'],
      ['Chile', '🇨🇱'],
      ['Colombia', '🇨🇴'],
      ['Corea del Sur', '🇰🇷'],
      ['Costa Rica', '🇨🇷'],
      ['Croacia', '🇭🇷'],
      ['Dinamarca', '🇩🇰'],
      ['Ecuador', '🇪🇨'],
      ['El Salvador', '🇸🇻'],
      ['Emiratos Arabes', '🇦🇪'],
      ['Escocia', '🏴󠁧󠁢󠁳󠁣󠁴󠁿'],
      ['Eslovaquia', '🇸🇰'],
      ['Eslovenia', '🇸🇮'],
      ['España', '🇪🇸'],
      ['Francia', '🇫🇷'],
      ['Gales', '🏴󠁧󠁢󠁷󠁬󠁳󠁿'],
      ['Georgia', '🇬🇪'],
      ['Ghana', '🇬🇭'],
      ['Guatemala', '🇬🇹'],
      ['Hungría', '🇭🇺'],
      ['Inglaterra', '🏴󠁧󠁢󠁥󠁮󠁧󠁿'],
      ['Iran', '🇮🇷'],
      ['Italia', '🇮🇹'],
      ['Jamaica', '🇯🇲'],
      ['Japón', '🇯🇵'],
      ['Marruecos', '🇲🇦'],
      ['México', '🇲🇽'],
      ['Panamá', '🇵🇦'],
      ['Países Bajos', '🇳🇱'],
      ['Paraguay', '🇵🇾'],
      ['Perú', '🇵🇪'],
      ['Polonia', '🇵🇱'],
      ['Portugal', '🇵🇹'],
      ['Qatar', '🇶🇦'],
      ['Rep. Checa', '🇨🇿'],
      ['Rumania', '🇷🇴'],
      ['Senegal', '🇸🇳'],
      ['Serbia', '🇷🇸'],
      ['Sudáfrica', '🇿🇦'],
      ['Suecia', '🇸🇪'],
      ['Suiza', '🇨🇭'],
      ['Túnez', '🇹🇳'],
      ['Turquía', '🇹🇷'],
      ['Ucrania', '🇺🇦'],
      ['Uruguay', '🇺🇾'],
      ['USA', '🇺🇸'],
      ['Venezuela', '🇻🇪'],
    ]);

    const formatDateForURL = (date) => date.toISOString().slice(0, -5).replace(/[-:]/g, '') + 'Z';

    [...document.querySelectorAll('.liveresults-sports-immersive__match-tile')].forEach((x) => {
      const event = {
        tournament: x.querySelector('div > div > div > table > tbody > tr:nth-child(2) > td > div > span:nth-child(1)')?.textContent.trim() ?? '',
        date: new Date(x.querySelector('div > div').dataset.startTime),
        // don't use classes local|visita because they only appear in futbol events
        localTeam: x.querySelectorAll('div.ellipsisize')[0].querySelector('span')?.textContent.trim() ?? 'TBD',
        awayTeam: x.querySelectorAll('div.ellipsisize')[1].querySelector('span')?.textContent.trim() ?? 'TBD',
      };

      // fixes the name
      event.localTeam = TEAM_NAME_FIXES.has(event.localTeam) ? TEAM_NAME_FIXES.get(event.localTeam) : event.localTeam;
      event.awayTeam = TEAM_NAME_FIXES.has(event.awayTeam) ? TEAM_NAME_FIXES.get(event.awayTeam) : event.awayTeam;

      // add a flag if its nations
      event.localTeam = NATIONAL_FLAGS.has(event.localTeam) ? `${event.localTeam} ${NATIONAL_FLAGS.get(event.localTeam)}` : event.localTeam;
      event.awayTeam = NATIONAL_FLAGS.has(event.awayTeam) ? `${NATIONAL_FLAGS.get(event.awayTeam)} ${event.awayTeam}` : event.awayTeam;

      x.style.position = 'relative';

      // creates the button to add the event
      const button = document.createElement('a');
      button.style.position = 'absolute';
      button.style.bottom = '0px';
      button.style.right = '0px';
      button.style.marginBottom = '5px';
      button.style.marginRight = '6px';
      button.onmouseenter = (e) => { e.target.style.opacity = 0.5 };
      button.onmouseleave = (e) => { e.target.style.opacity = 1.0 };

      // inserts a google calendar icon
      button.innerHTML = '<svg width="20" height="20" xmlns="http://www.w3.org/2000/svg" viewBox="186 38 76 76"><path fill="#fff" d="M244 56h-40v40h40V56z"/><path fill="#EA4335" d="M244 114l18-18h-18v18z"/><path fill="#FBBC04" d="M262 56h-18v40h18V56z"/><path fill="#34A853" d="M244 96h-40v18h40V96z"/><path fill="#188038" d="M186 96v12c0 3.315 2.685 6 6 6h12V96h-18z"/><path fill="#1967D2" d="M262 56V44c0-3.315-2.685-6-6-6h-12v18h18z"/><path fill="#4285F4" d="M244 38h-52c-3.315 0 -6 2.685-6 6v52h18V56h40V38z"/><path fill="#4285F4" d="M212.205 87.03c-1.495-1.01-2.53-2.485-3.095-4.435l3.47-1.43c.315 1.2.865 2.13 1.65 2.79.78.66 1.73.985 2.84.985 1.135 0 2.11-.345 2.925-1.035s1.225-1.57 1.225-2.635c0-1.09-.43-1.98-1.29-2.67-.86-.69-1.94-1.035-3.23-1.035h-2.005V74.13h1.8c1.11 0 2.045-.3 2.805-.9.76-.6 1.14-1.42 1.14-2.465 0 -.93-.34-1.67-1.02-2.225-.68-.555-1.54-.835-2.585-.835-1.02 0 -1.83.27-2.43.815a4.784 4.784 0 0 0 -1.31 2.005l-3.435-1.43c.455-1.29 1.29-2.43 2.515-3.415 1.225-.985 2.79-1.48 4.69-1.48 1.405 0 2.67.27 3.79.815 1.12.545 2 1.3 2.635 2.26.635.965.95 2.045.95 3.245 0 1.225-.295 2.26-.885 3.11-.59.85-1.315 1.5-2.175 1.955v.205a6.605 6.605 0 0 1 2.79 2.175c.725.975 1.09 2.14 1.09 3.5 0 1.36-.345 2.575-1.035 3.64s-1.645 1.905-2.855 2.515c-1.215.61-2.58.92-4.095.92-1.755.005-3.375-.5-4.87-1.51zM233.52 69.81l-3.81 2.755-1.905-2.89 6.835-4.93h2.62V88h-3.74V69.81z"/></svg>';

      // adds the link to create the event
      button.target = '_blank';
      button.href =
        'https://calendar.google.com/calendar/render?action=TEMPLATE' +
        `&text=${event.localTeam} - ${event.awayTeam}` +
        `&dates=${formatDateForURL(event.date)}/${formatDateForURL(new Date(event.date.valueOf() + 5400000))}` +
        `&details=${event.tournament}`;
      x.appendChild(button);
    });
})();