Concat fields returning "true" with custom column

Hello! I’m trying to create a custom column in metabase that returns a string based on several fields being “true”.

For example:
[Field 1] = true
[Field 2] = false
[Field 3] = true

I want the custom column to return "Field 1, Field 3"

I’ve tried several different things, but can’t get any of them to work. Does anyone have advice on how to create this as a custom column?