Localizing string resources added via build.gradle using "resValue"

This is in continuation to an answer which helped me on this post

We can add the string resource as follows from build.gradle:

productFlavors {
    main{
        resValue "string", "app_name", "InTouch Messenger"
    }

    googlePlay{
        resValue "string", "app_name", "InTouch Messenger: GPE Edition"
    }
}

It works like a charm and serves the purpose of having different app names per flavor. (with the original app_name string resource deleted from strings.xml file.

But, how do we add localized strings for this string resource added from build.gradle ?

Is there an additional parameter we can pass specifying the locale? OR Possible to do it using a gradle task?

Note: I cannot do this using strings.xml (not feasible because of several ways in which my project is structured)