A total of 1 review of this product on Reddit.
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I use GOM Audio (supports DropBox, Google Drive and OneDrive) – also great equalizer/volume booster/left-right balance – but that wouldn’t work for listening to Spotify.
In Spotify pressing on:
Settings | Music Quality | Equalizer
will bring up a dialogue box allowing you to choose any equalizer app you might have installed(e.g. Equalizer FX Pro)
However I have yet to find an Equalizer app that has left-right control balance.(unless you are rooted)
You could always go crazy and spend $19 on this headset with independent left-right volume controls 🙂
… or try and find a 3.5mm audio balance volume control extension cable like this one
I don’t think Android allows changing left-right balance at the system level[some Samsung phones do]
EDIT: Having just read ANBUx23’s comment I can confirm that on my Huawei Mediapad M3(Android 7.1/emui 5.0.3) …
Settings | Accessibility | Hearing | Sound Balance
brings up a left-right volume balance slider that works.
However on my Android One Moto x4 running Pie I cannot find such a setting.
Conclusion: Hearing | Sound Balance is not in Stock Android – some device manufactures have added it.