Getting useable data from the MotoGuzzi-app

[dunz]

I've exported my data from the MotoGuzzi-app, and have figured out it's a base64-encoded-json-file, that then has ANOTHER base64-encoded string called "payload" in it, but when I decode that it's just some weird binary format... nothing I recognize.

Anyone else had any success in figuring out the format? I suspect it's just missing a file header, looks like compressed data, maybe?