Webservice request from android app seems to be overridden with user agent string 'phandroidappl'
I am using an android app that utilises web service requests (Philips Hue). However, when announcing itself on the server it uses the user agent string 'phandroidappl' which seems not to have its origin in the app but in the android layer of my Jolla. This is my conclusion since it is the original app by the publisher (proved) and exactly the same app used on an android-only device works well.
The publisher refuses to handle this string (yet) asking me whether I could change it on my phone. I tried grep to find the file containing the string but had no success.
Does anybody here know about where or in which file this string could be located, where it might emerge from or how to handle this on my Jolla?