dnd 5th – How can a druid domesticate a monstrosity?

Note: I am not interested in TRAINING but in the process of DOMESTICATION of creatures whose descendants will be used for training

I play Dwarf, and in the past, I started a personal quest to find a creature that could be more useful in mines.

As a druid, I am reluctant (do not want) to take animals to the mines and so I decided to mainly examine the monstrosities, as well as giant lizards that can be a driving loaf after having them seen mounted by lizards.

I know it's a long and tedious process that could take several generations of animals to succeed.