Brazilian Sign Language (Libras, bzs, Q3436689) is the first language of deaf communities in Brazil, and Sutton SignWriting is the dominant writing system.
Wikidata already support the sign languages ase, bfi, gsg, and bzs (T286213) in lexemes. There's a bzs test wiki in Incubator.
American Sign Language is probably the only sign language with its own monolingual code (ase) in Wikidata by now.
