How to Add Game Data Folder to Heroic Game Import?

How can I add a game data folder to an imported game? The exe expects a folder with other data, but I can't add it to the install directory, and I don't see the game exe or path in the prefix folder. Is there an option somewhere to add my game data folder and dlls or do I need to move the folder and data somewhere? On Steamdeck via Flatpak. Thanks.
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