How to alter result history of Speedtest?

I'm using unrooted S6 edge and I'd like to alter the Ookla Speedtest local result history.
Can anyone give me some pointers as to where I can find history file?
If it's not possible to edit the history file, can someone give me advice as to how I can go about faking the Speedtest results in other ways through my Android phone?

I checked my Android/data folder through MTP connection to my Linux machine but couldn't find Speedtest's folder.
/data folder in root directory shows empty when I access it through file manager in the phone itself.

Thanks.