There is some server-rendered HTML that happens with the current version, that's how you can paste a link places and it will populate oembed and opengraph data.

However, with v0.1.2 I'm going back to the simpler server-rendered bot/scraper page. For your particular case, it should be easy to add additional links or attributes if you want to put up a PR with whatever you're looking for.

https://github.com/owncast/owncast/blob/develop/static/metadata.html.tmpl

I did read up on the current and in-progress templates prior to putting the feature request in, but solving this in a straightforward way in a docker environment was a little bit more involved than I think a typical user might want or be able to hack through.

Might put my money where my mouth is and submit a PR for it if you're OK with that. Just need to find some time :)