wayland, wine 10 and heroic

Heroic runs fine on wayland using xwayland. Wine 10 now supports directly running games with wayland. On steam just using "unset DISPLAY; %command%" can work (the var has to be unset, "DISPLAY=" sets it to "" and does not work). How do I get heroic to unset DISPLAY before starting a game? Please note that I typically ask heroic to use gamescope with "-O DP-1 -f -W 2560 -H 1440 --hdr-enabled" as additional options.
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