Spotify + Flatpak + HiDPI

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Spotify + Flatpak works great. No issues with that.

However, HiDPI screen is giving me problems as Spotify not automatically scale the screen. In normal Repo install I need to edit /usr/share/applications/spotify.desktop and add there --force-device-scale-factor=2 so I can see something from my 4K laptop screen.

SO! Where I can do this same trick for Flatpak? I think it is somewhere under: /var/lib/flatpak but I seem to not find the correct file to edit... there is multiple spotify.desktop files in multiple different folders...

I know that this is not the perfect way to fix this issue, so if any of you have some sort idea how could I launch Spotify Flatpak with that --force-device-scale-factor=2 switch I would be happy man! :)