FindAllShadowRoots.js

function discoverAllShadowRoots(){
      let  shadowroots = []
    function discover(elem){
        let elemshadowroots = [...elem.querySelectorAll("*")]
        elemshadowroots.push(elem)
        elemshadowroots=elemshadowroots.map(z=>z.shadowRoot).filter(z=>z)
        elemshadowroots.forEach(discover)
        shadowroots.push(...elemshadowroots)
    }
    discover(document.body)
    return shadowroots;
}
document.querySelectorAllShadowRoot = function(selector){
    let shadowRoots = discoverAllShadowRoots()
    for (let index = 0; index < shadowRoots.length; index++) {
        const sr = shadowRoots[index];
        srsl = sr.querySelector(selector)
        if(srsl)
        {
            return srsl 
        }
    }
}