Have you considered making it a progressive web application (PWA)?
I've found that to be pretty straight forward (I don't know anything about GDevelop though).
It allows a game to run in the browser OR be installed (on both desktop and mobile) so that it runs in its own window, feels like a native application, and functions offline. You can also publish them on the Google Play store, and in fact a lot of well known apps are actually PWAs - Tinder, Instagram, Spotify, Uber...
You said you've exported a web version, so yes, it most likely should be possible, though it might take a while. You should just need to add a script and some meta tags to the HTML, and add a few other small files (a manifest, a service worker and some icons), and then you must host the file on a secure website (ie. https, not just http - getting that set up is actually the hardest part).
When I was doing it (not starting with a GDevelop app), the most helpful tutorials I found were these:
https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps/Installable_PW...
https://medium.com/james-johnson/a-simple-progressive-web-app-tutorial-f9708e5f2...
https://web.dev/offline-cookbook/
Anyway, I'm not saying it's definitely the way to go, but it might be worth looking into.
