Is it possible to inject timed meta data into the RTMP stream? Like how we can do in Wowza as described by this article - https://www.wowza.com/forums/content.php?149-How-to-inject-cue-points-or-metadata&page=2
also, does Nimble support transforming these metatags into ID3 tags for transport inside a HLS stream?
What is the equivalent in DASH?
Nimble Streamer doesn't allow that unfortunately. It passes through the metadata when republishing RTMP but doesn't do it when transmuxing to other protocols.