You will find some resources about packaging in the debian Mentors Faq., including about the intent to package (ITP) process.

More than a year years ago, somebody requested yazi to be packaged, and changed it to a ITP, but the bug is open (i. e. It has not been packaged or added). May be the first step should be send a email to the bug asking for the status of the bug.

Also, about packaging rust programs, you should check the documentation of the debian rust team packagers.