https://twitter.com/JeroenFrijters/status/1615204074588180481 alternative solution for https://github.com/MinBZK/woo-besluit-broncode-digid-app/blob/ad2737c4a039d5ca76633b81e9d4f3f9370549e4/Source/DigiD.iOS/Services/NFCService.cs#L182-L206 this function

getPercentageRounds.js

const getPercentageRounds = function(percentage = 1) {
    const blueSpotSymbol = "🔵";
    const emptySpotSymbol = "⚪";
    // 1 to 10
    const convertedPercent = Math.ceil(percentage * 10);

    const blueSpots = Array(convertedPercent).fill(blueSpotSymbol);
    const emptySpots = Array(10 - convertedPercent).fill(emptySpotSymbol);

    return [...blueSpots, ...emptySpots].join('');
}