Running Custom Games Offline

Since Heroic is a flatpak, it seems to be all or nothing with network access. On my system install of lutris on bazzite I am able to simply add a command prefix for bwrap to block the network. On heroic, it seems my only option is to use flatseal to completely disable the network. Is there any intention to allow more granular control of individual game/prefix access to things such as network devices, USB devices, etc?
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