In his original install walkthrough video, it was once available to be installed.  
https://youtu.be/37iJjKz94Qw?si=4Oe7oMZAMND3rBcf&t=160

Seems like SN has locked people out from that ability now. Prob. because SN actually has some competition, with 3rd parties creating better products/apps for JIRA sync'ing, so SN locked everyone out to try to protect their own product. 

Disappointing, but not surprising I suppose, as SN continues to strangle it's own product by implementing even more restrictions, for greater profit.