Is it possible to dynamically assign the default value of a filter in UI Builder?

Hi,

I am building a home page in UI builder with some reports that need to be filtered by location. 

I am wondering if it's possible to dynamically assign this default value in the filter to be the same as the users locations.

I should be able to grab the current users location with a client script and update a client state parameter with the location. But I'm not sure how to get this value into the default value of the filter.

Any ideas would be great? 

Thanks in advanced