How to add text to every item in a list

I’m in Workflow and trying to edit a field after the user does something. The field is of type list, and I want it to basically be a replica of another field which is a list but where each item in the list has the date appended to it. Ultimately this is being exported to an AirTable via Zapier, so AirTable needs a comma separated list of values so that it will save them as a multi-select.

Another option maybe is to convert my list to a text, and then add the date every time there’s a comma? Maybe using something like this? Add texts to a List of Texts

Write the data in a repeating group and from there you can manipulate and push it back to DB with required changes with a Do…When statement or Save button on each section