Untested, but this should work everywhere where you can add custom HTML script tags. I would assume that most forums sanitize their posts, to not let users inject custom scripts in there.
Discussion
Gotcha/ I want to build a site using NOSTR eventually that is like Circle.so and Wix with gamification, courses, members forums and groups , a blog and store/payments for membership and /or single courses that uses #V4V pay what you want model - can we do that ? It needs desktop and native mobile app upgradable to white label app
All content should be zappable