An alternative that I haven't tested but am 95% sure will work is (using GrapheneOS)

1. Enable multiple accounts

2. Create a fresh account with a tor VPN (orbot)

3. Create the service you want to access via onion. Run the service.

4. Switch to main account, but leave the new account running. You should now be able to call the onion service from your main account.

I haven't tested this, and I am not sure if this is useful to anyone, but just in case...