“WPML Enable” plugin provides a convenient solution for installing PWAs on WPML-based websites while taking into account the selected language. By dynamically adding the language code to the PWA’s start URL, the plugin ensures that users can enjoy a seamless and language-aware experience when installing and using the app on their devices.
To start the process first make sure that WPML is installed. To do this check this tutorial: Insallation Guide.
Step 1: Firstly, download the plugin from here SuperPWA Pro and install it.
Step 2: After that please make pro version activate. You will see this kind of dashboard when you will click on Add-on.

Step 3: Kindly click on Activate button and click on settings.

Step 4 : Mark check this “Enable WPML” option and save it.

The Output
You can see in the result that the Start URL will have the language added as a suffix to the post URL, based on the user’s default language.

This way you can use this option for PWA on WPML Multilingual sites.