Getting back mileage gross value on creation?

Hi API-team,

To create a mileage expense I specify the mileage only (not gross value) in
my POST request. On successful creation, I get back (in the header of the
response) the new expense id. Would be handy for the calculated/assigned
gross value to be returned also (in the response) for my local copy of the

Would this be possible and something that could be added to the API

I guess I could send a GET request following my POST request or calculate
the gross value within my app but that seems a bit wasteful and redundant.