Missing Parameters => Representation from /time-offs & Mail from /employees

Hello,

I'm trying to get some Data from the API and I'm looking for 2 things, that are somehow not returned by the API.

from the /time-offs Endpoint I would need the Representation for an entry, so the employee that's filling in for the absent person
And why are the Mail adresses not returned from the /employees Endpoint?

Is there a possibility of getting these Parameters from the API or are there plans in the near future to implement them?

Cheers from Berlin
Jakob