There is currently work being done https://github.com/getAlby/lightning-browser-extension/issues/3232

nostr:nprofile1qy2hwumn8ghj7erfw36x7tnsw43z7un9d3shjqpqrszx0h6nu2s4rj9g0r8ny5kyfa0lauez6dy368dtyx4km5rw9dyqptzp4a was working on it. I could not follow up with in the recent weeks sadly.

It is using the podcast:value tag. Do you have feedback on it? would be cool to get it in substr and also do an announcement of it.

I was also additionally thinking about paid content requestable through l402.