Get a string resource from "values" folder in Android

I have a default string that needs to be used on the app, no matter the language.

Thinking that it should be independent from the app language I did not put the string inside any of the string.xml files for the different languages. Instead I created another myString.xml file inside values folder, looking like that:

myString.xml

<resources>
    <string name="myStringResource">This text shall be available
for the entire app no matter the language
</string>
</resources>

But now I am not able to access this string.

Is it the wrong way to do that? And if yes, then how can I achieve the above explained scenario?