3D WebView for Android with Gecko Engine embeds the Mozilla GeckoView library as its browser engine. When the GeckoView library AAR file is included in the application, it causes the Android WAKE_LOCK permission to be included to the application's manifest because Gecko requires WAKE_LOCK in order to function correctly. I'm not aware of a way to remove the WAKE_LOCK permission and allow Gecko to function correctly.
The Meta Quest Store guidelines specify that if an application uses the WAKE_LOCK permission, the submitter must include a note for the reviewer indicating why the permissions is required:
Meta allows some other permissions only on a case-by-case basis. If any are necessary for your app, tell Meta about them in the “App Submission” page. After you select “Submit to Store” a “Notes for the Reviewer” field appears in a dialog box.
So, if you're submitting a Meta Quest app, please send a note to the reviewer indicating that the WAKE_LOCK permission is required in order for the Gecko browser engine to function correctly. Many developers have used this approach to successfully submit an Meta Quest app that uses Gecko.