Animal handling check new companions for other party members

DM here.

I plan to give the party an opportunity to find a homonculus in a defeated necromancer lair and possibly make it there animal companion if they wish to.

The druid characters could probably make the animal handling checks easily. However other characters could also be interested in the companion.

The question : is there an official mechanic other than the help action to allow the druide to help the sorcerer to acquire the homonculus as a pet ?

If not how would you implement a rule to do so and explain it narratively (not just "the druid role for you")