How to add multiple tags in multiselect field from Zapier

Hi. I have a zap set up in Zapier such that when someone books a call in Calendly, it finds and updates the record in Airtable and then adds a tag ‘‘Info Session’’ to a Multiselect field. This works fine.

However, I don’t want this tag to overwrite the other tags that are already there under that same field. I want it to stack the additional tags and NOT overwrite them.

I will appreciate a solution to this. It is quite urgent. Thank you.