Turn multi-reference field values into a text string

I’m trying to achieve something fairly simple…

I want to turn the values from a multi-reference field into a text string in another column so then I can filter results by this newly created text string (since it appears its not possible to filter by the multi-reference column directly)

I am not sure, but perhaps this one will help you …
https://www.wix.com/corvid/reference/wix-fetch/wixfetchresponse/json