Howl of the Wild and grafts

In the story description at the start of the chapter it mentions that grafts can be created using things from the creature that don't kill it, like hairs and such. I like to think it's sort of like extracting DNA, and I like the idea of not having to kill a creature and carve it up to get the graft.
The rules mention that grafts can be created from scratch but typically need a special jar to remain viable. Am I missing somewhere rules for creating the grafts? Is that a separate crafting check that I need crafting for instead of medicine and takes additional days? Or as part of the same 1 day check using medicine to graft a tail onto the party member am I able to also create/grow the tail? If it's all the same check in the same day, why would I need a special jar? .. Perhaps I'm reading too much into it, but if anyone can clarify, I'd be most appreciative.

If it has a level, gp value, and is a physical object, then it can be created with the Crafting activity.

Insofar as I'm aware, you would use the normal crafting rules.

You craft it the same way you would any other item, The text about the jar is simply fluff as there isnt any specialized item for Graft Storage.

From my reading; Graft Technician is not needed to craft or implant a graft. But it give you a bonus and the formulas which you actually do need when implanting. Something you would otherwise have to buy or Craft with the Inventor feat