YouTubeRSS.js

var channels = "";
ytInitialData
    .contents
    .twoColumnBrowseResultsRenderer
    .tabs[0]
    .tabRenderer
    .content
    .sectionListRenderer
    .contents[0]
    .itemSectionRenderer
    .contents[0]
    .shelfRenderer
    .content
    .expandedShelfContentsRenderer
    .items
    .map(function(item) {
        let title = item.channelRenderer.title.simpleText
        let description = ''
        if (item.channelRenderer.descriptionSnippet != null) {
            description = item.channelRenderer.descriptionSnippet.runs[0].text.replace(/(\r\n|\n|\r)/gm, "")
        }
        let xhmlUrl = 'https://www.youtube.com/feeds/videos.xml?channel_id=' + item.channelRenderer.subscribeButton.subscribeButtonRenderer.channelId
        let htmlUrl = 'https://www.youtube.com/channel/' + item.channelRenderer.subscribeButton.subscribeButtonRenderer.channelId
        channels = channels + '<outline text="' + title + '" title="' + title + '" description="' + description + '" type="rss" version="RSS" htmlUrl="' + htmlUrl + '" xmlUrl="' + xhmlUrl + '"/>\n'
    })
console.log(channels)