Share with me the highlight event from Amethyst, and I’ll add it to the highlights matrix

It doesn't support Nostr highlights, but I'm saying Amethyst has the capability. I can highlight text and share the text to Amethyst as a kind:1. All @Vitor Pamplona would need to do is change text highlight shares to use the highlight kind and spec instead.

Can you pass selected text in the browser using an intent?

Yes. I just did that above.

Yes I just tested it myself. Nice, no need for browser plugins on Android.

Or any dev since Amethyst is open source.