Cannot use Attributes with special Characters in the Popup content template

I tried to use an Attribute with an ‘@’ in its name in the Popup content template, and it just displayed the query. I also tried to use other special Characters like ‘!’, ‘$’, ‘/’ etc. Only a colon worked.

My Popup Content template looked like: Accessibility: {@accessibility}

I also tried to escape the @, but it didn’t work.

Is there a way to bypass this?