tgb1 Don't believe there's any supported way to do exactly what you're asking, but you can use storage scopes to give that app access to a specific file or folder.
You may also want to polish up on how storage access works on Android by following the link in the storage scopes section I shared a link to above. If you know how storage and storage permissions work, you can make sure other apps don't get access to the files/folders you don't want them to have access to.