How to save checkbox list values in a datalabel and array

Hello support team,

I use a SharePoint 2019 list as a source for a check box list. I works fine to fill the checkbox, but I would like to show the vales checked in the checkbox list (more than one value is checkable) in a datalabel field.

I show one value, but not all the others. How can I show all the checked values there?

Best regards

Matthias