The following bookmarket shows a popup with the name of the participants separated by comma(,) .
javascript:((n=2e3)=>{try{function h(a,b=0){if(b>7||"object"!=typeof a||null===a||a===window)return;let c=Object.getOwnPropertyDescriptors(a);for(let d in c){if(d.startsWith('["spaces/'))return Object.values(a);let e=h(c[d].value,b+1);if(void 0!==e)return e}}let i=Object.entries(window).find(a=>a[0].startsWith("closure_lm_"))[1],e=h(i),a=[];function j(b){for(let c in b){let a=b[c];if("object"==typeof a&&null!==a&&"string"==typeof a[1])return a[1]}}for(let c=0;c<e.length;c++){let f=j(e[c]);-1===a.indexOf(f)&&a.push(f)}if(0===a.length)throw new Error("Could not find any name.");a.sort((a,b)=>a.localeCompare(b));let g=a.slice(1).reduce((a,b)=>(a[0].length+b.length+1>=n?a.unshift(b):a[0]+=", "+b,a),[a[0]]).reverse();for(let b=0,{length:d}=g;b<d;b++){let k=1===d?"":" ("+(b+1)+"/"+d+")",l="Please find the list of participants below"+k+".";if(null===prompt(l,g[b]))break}}catch(m){alert("Unexpected error when runni