How do I make enemies that avoid player?

Hi, I'm making a tps isometric shooter. I've a scene with the player e some enemies.

The player is controlled with a virtual joystick which gives the player direction. The movement is provided using the rigidbody's velocity.

Every enemy in the scene has a navMeshAgent, which is used to follow the player avoiding static obstacle in the scene, like columns and walls. The obstacles don't have a navMesh obstacle component. I've used a navMeshSurface to bake the walkable surface of the level.

The enemies follow correctly the player, avoiding walls and columns but I want that they avoid the collision with the player too. I need that, if the player is too close, they move back.

How can I make it?