Jai has not been released to the public. If people are looking for a language that has been very heavily influenced by it and is in a near category, then that would arguably be Odin (https://youtu.be/M763xHjsPk4). Odin is open to the public, where nobody knows for sure when Jai will.

If looking for a more general purpose feature rich newer language then people might want to also check out Vlang (https://github.com/vlang/v/blob/master/doc/docs.md).