Combining Learning Agents with Behavior Tree ?

Hello. I’m a student working on an Action RPG game.

I’m entirely new in LA, and I just have completed following example.
Unreal Engine 5.4: Learning Agents for Character (Part 1)

I want to implement the boss’s actions with Reinforcement learning using Learning Agents.

I think it will be difficult to make detailed movements with Reinforcement Learning alone, so I want to use Behavior Tree to make them more detailed.

How can I combine LA and BT?

Also, is it valid to use Reinforcement Learning to create bosses for RPG?