Chyron creation/editing

I would like to annotate my asciicast v2 file to add comments/annotations. I’m intentionally not calling this a banner, since asciinema has a definitiion for that as the initial screen before it plays.

It would be great if this post-production tool could take a time marker and a text string that could insert these in a new asciicast file with a chyron on the bottom of the asciicast.

Has anyone done this?

https://github.com/hydrargyrum/asciinema-comment is the closest thing I’ve seen.