webfinger through CloudFlare Worker

index.js

/**
 * 1) Create a worker with the below content, replacing your target account
 * 2) Assign that worker to the .well-known/webfinger* route on your domain.
 */

// Change this to yor target account
const account = '[email protected]';

addEventListener("fetch", event => {
  event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    const domain = account.split('@')[1];
    return fetch(new Request(`https://${domain}/.well-known/webfinger?resource=acct:${account}`));
}