Use System MangoHud binary from flatpak Heroic Launcher

Hi,
I have Heroic Launcher installed via flatpak.
I have MangoHud installed through the system package manager, in my case that's Portage.

I enabled the "MangoHud" option in the Heroic Launcher Settings, but it's not working.
MangoHud works fine for games outside of Heroic Launcher.

I suspect this is a flatpak permissions issue.
I have tried enabling the "All system libraries, executables, and static data" permission for Heroic Launcher using FlatSeal, but that did not fix it.

What permissions should I enable for Heroic Launcher to be able to use my system MangoHud?

Alternatively, is this likely a different type of problem?

Thank you!
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