I plan to give the party an opportunity to find a homonculus in a defeated necromancer lair and possibly make it their 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.
Is there an official mechanic (other than the help action) allowing Character A (with strong animal handling skill) to help character B (not as strong with the skill than A) to bond with an animal to make it a companion and train it?
If not, how would you implement a rule to do so and explain it narratively (not just "the Character A rolls for you")?