Translating a label with variable content is trivial with twig. Translating variable values on the other hand isn't that obvious. So here area a few examples how to do so.

Translate value in twig template:

{{ value|trans() }}

Translate with additional key in front of it like for example category.*:

{{ ('category.' ~ value)|trans() }}

Translate with additional key in front of it and with a special domain:

{{ ('category.' ~ value)|trans({}, "domain") }}