ACF field inside QueryLoop items class or id

schnoedeltroedel

Is it possible to have an ACF field as a dynamic part of my class or id?

Example:

I created a field group containing a number field idx. I would like to create an id like "my-id-{acf:idx}

I already tried this. It's not working. Is there another way to achieve this or a similar approach to have this information for each item in the query loop?