This is a sign language that can be written with Sign Writing; this could be implemented the same way as https://phabricator.wikimedia.org/T286213 "bzs" for Brazilian Sign Language for lexemes. There are a number of good resources online for it to add lexeme content.

Language code: pks
Autonym: اشارہ
Item: https://www.wikidata.org/wiki/Q22964057
Example lexeme: https://www.wikidata.org/wiki/Lexeme:L1037110
Example item requiring monolingual text (for native label of city): https://www.wikidata.org/wiki/Q173985

The written autonym provided is one given in Zeshan (2000) Sign Language in Indo-Pakistan. It is a word shared among most languages of Pakistan and used a stand in for the signed autonym in writing.

Notes
This is a follow up of T317161
Which added pks as a Lexeme language code but not as a monolingual text code