how to ask to change location for jury service
Are you yourself serving on the jury? If that is the case, I guess it would depend on the country you are in. Here in the U.S. you can't (as far as I know) ask to change your location to somewhere outside the where place you live. You can only ask to have your jury duty postponed until you return home.
However, assuming that it is allowed, you might form such a request as follows:
I would respectfully ask to be allowed to do my jury duty in another location, namely, __________ .