2D Sidescroller enemy AI jump help! Picture Included!

in your player code create a bool that if player is in up boxCollider2D then make the bool true. then in your enemy code create another bool when he's in down collider2D then the bool true.

then in your enemy code use something like this

    public playerController player;   // object that has your player codes
   void Awake () {
 
     player = FindObjectOfType<playerController> (); // so you can access to script of  the object that has playerController script.

}

              void Update(){
          if (player.IsinTheUpCollder2D && enemyIsIntheGroundCollider2D) {

// IsinTheUpCollder2D it's box collider that is on the upper Ground //enemyIsIntheGroundCollider2D it's box collider that is on the Ground

                                    jump;
     }

}

hope you get the idea