Bluez and HID Report Descriptor

Hi,
Great work with bluez!
But i have some question, maybe you can give me a short reply?
I want to emulate a bluetooth gamepad with raspberry pi, everything's fine, but the connected android system does not know how to use the incoming packages, so i have to send, provide or store the HID Report Descriptor anywhere,
the big problem for me is, i don't know where or how.
Can you help me with this problem?
Would love to read from you.
Best Regards,
Dirk