A list with comma from an array

Hi, I’m new to Adalo and trying to make quite simple feature:
I make a user to login. Create a user record with link to products list.
Then User can select several products using multi dropdown menu. After that in Users’s record I can see selection of products (links).
Then I would like to use that selection as input field. So, basically I need to take the user’s array of selected products and create one text line with comma’s.

I can’t figure out how I can do that. Any suggestion?

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