Custom metadata agent to read GRP id3 tag of mp3 album into the 'Collection' field in Plex (for adding audiobooks to Collections automatically)

Is it technically possible to create a custom metadata agent that can extract metadata from MP3 files and insert it into the ‘Collection’ field within Plex?

I already have a custom agent to do this for the audio book description - it reads the audiobook description data from the TIT3 or COMM frames and adds these to the Album Review field in Plex. This is then displayed in Prologue. I want to do the same for the Collection(s) the audiobook belongs to. i.e read the ID3 metadata from the GRP (Grouping) frame in the MP3 and add this to the ‘Collection’ field of the album in Plex. (Ref here.

This will save having to manually re-enter this data each time you rebuild the library.

Does Plex allow this? Is the Collection field exposed to a custom agent? I can’t find any developer documentation anywhere.

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