My team found a hack, that allows the selection of Multiple choices, for selections that include a comma.
The hack was to use a special character, that looks like a comma, but is not the same.
If you see the screen below, the commas look identical, but one is created using special characters.
But when you split, you will also need the special character as well.
You can make a copy of the sheet here to try:
This is how it looks like on Glide:
Have fun!