Sorry, forgot to do this last night. Here are the tags:
First, there is the footnote tag. Footnotes are just prepended by a “{\SCRV_FN=” and appended with a “\END_SCRV_FN}”, like this:
Annotations work pretty much the same, but they also contain RGB colour information. The following would create a red annotation:
If you typed this into a document in Scrivener, next time you opened the project, you would have an annotation or footnote.
Hope that helps with converting your projects.
All the best,
Keith