Convert values selected from Combo Box to a Comma separated string

I have a Combo Box with dummy values A, B, C , D and multi-select On. I want to select multiple values and display them in a Label as comma-separated string

For this, we can use function Concat. Below is an example for the same

As these are hardcoded values in Combo Box, I took Value in Concat function.

If you are getting these values dynamically, you can also use Result.