Use liveblocks Yjs implementing comments overlay.

import { createClient } from '@liveblocks/client';
import { getYjsProviderForRoom } from '@liveblocks/yjs';

const client = createClient({
    throttle: 16,
    publicApiKey: 'pk_dev...',
});
const { room, leave } = client.enterRoom('my-room-id', {
    initialPresence: { cursor: null },
});

const yProvider = getYjsProviderForRoom(room);
const yDoc = yProvider.getYDoc();