How do I create a Google Sheet if it doesn't exist and update it if it does, with a dynamic sheet name?

I want to do one thing. Create a Google sheet if that sheet does not exist, and update the sheet if it does.

The sheet’s name is dynamic based on the incoming data. So if a sheet with the title eincoming data title] exists, create a new row in that sheet. If sheet with the title eincoming data title] does not exist, create that sheet.

I have tried with all the available Google sheet actions and custom paths, and am at a loss. How do I do this?