AI Player detect without having a target before detect.

Trying to figure out if a single ray can be fanned out. tying to get AI to detect player within a fov range. I have it on my player so that I can test it out before I transfer it. At the moment it only detects the line which is 1. to about only 0.8f. either side rotates. Am trying to make it where it will go to 0 on rotation or around 45 degrees on either. So far ray is lacking for this.

 void SeePlayer() {
         RaycastHit hit;
         Ray seenRay = new Ray(Player.transform.localPosition, Player.transform.forward);
         
         Debug.DrawRay(Player.transform.localPosition, Player.transform.forward * 10.0f, Color.red);
         
         if(Physics.Raycast(seenRay, out hit, meleeAttackDistance))
         {
             if(hit.collider.tag == "Enemy")
             {
                 if(Vector3.Distance(hit.transform.localPosition, Player.transform.localPosition) < 10.0f)
                 {
                     if(Vector3.Dot((hit.transform.localPosition - Player.transform.localPosition).normalized, Player.transform.forward) > 0) 
                     {
                         Debug.Log("HIT");
                     }
                 }
             }
         }    
     }

Trying to use Vector3.Dot() to get it when an object moves into this FOV that it will know something is their to go attack it.

My AI will not have a player Selected as a Target yet, so i tried modifying this code.

 if(Vector3.Distance(Target.transform.localPosition, Player.transform.localPosition) < 10.0f)
     {
         if(Vector3.Dot((Target.transform.localPosition - Player.transform.localPosition).normalized, Player.transform.forward) > 0) {
             Debug.Log("Hit");
         }
     }

Is their a way without raycast to check if a collider with a rigidbody enters inside of the FOV cone without needing a collider object to detect with an OnTriggerEnter? Needs to be able to detect without knowing what its target could be before hand.