How to set string resource length limit in Android?

It is known that Androd string resources support xliff namespace to annotate non-translatable string formatting placeholders, like this

    <string name="max_file_size_exceeded_template">File 
         <xliff:g example="some_image.jpg" id="file_name">%1$s</xliff:g>
         is too big and could not be uploaded.</string>

It helps translators to undestand what parts of string should not be modified. But sometimes I need to annotate some strings max length it they are used in UI control with limited size. What I want is add text length limit to warn translators about this. Something like max-length="24" max-lines="2" length-unit="char" Maybe, xliff supports such thing or it can be achieved in other way. I use Weblate for translations if it matters.

Solution

You can set this in Weblate, the Andoid format does not support this directly.

Click on edit (pencil) icon next to flags on the string.
Enter max-length:LENGTH as check flag.