Filename - Tag with multiple artists in filename

Hi, newbie here.

I’m trying to make tags based off of filenames but can’t seem to find out how to make multiple artist tags?

I’m converting a range of mp3s, they are all formatted as “Artist - Title” however, for multiple artists, they are comma separated (“Artist1, Artist2, etc. - Title”) is there anyway I can create multiple artist tags for each artist with Filename - Tag?

Also, I would like to be able to do this all in one go, so if I could have Mp3tag figure out how many artists are on each track and tag accordingly, instead of needing to go through each file manually.

If both conditions are mandatory, then the answer is "no", that cannot be done.
If the result counts, then I suggest either an action group with 2 actions:

  1. to import the fields from the filename with "Guess values"
  2. Split ARTIST by separator