Run flatpak apps under proxychain?

So I don't know how I should run flatpak apps under proxychains. I am currently trying to run it with FreeTube. But the command to run FreeTube from flatpak is the following:

/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=/app/bin/run.sh --file-forwarding io.freetubeapp.FreeTube @@u %u @@

And I tried putting proxychains4 in there but it never worked lol.