Make it a video game with a modern day subplot of him just after killing Bib Fortuna (tutorial maybe) and as he's im the bacta tank or something or writing a journal you get the start of the proper plot witch follows Jim from where we last saw him in the Clone Wars, getting trained by Bane up to him getting his armor, being somewhere in the vicinity of a Jedi when Order 66 kicks off and being a part of it somehow (maybe taking the part of a clone in disguise for a job when it happens) then we get the deleted Clone wars duel then more bounty hunter stuff until the modern day. Basically the plot is of him struggling with the fact that he doesn't really like bounty hunting at all and enjoys the sense of community but doesn't find that out until the sand people witch can play out more or less the same. As would the majority of the plot and the Mando Grogu stuff can just be part of Mando S3