How to do Inputs in Update and AddForce in FixedUpdate, infinite jumps ?

I know this has been asked a lot.

But most solution involved checking if player is grounded.

My game doesn't have a ground.

Here is the code, how can I add forces in fixedupdate by taking input signal in Update ?

 void Update()
     {
 

         if(Input.touchCount > 0)
         {
             for(int i=0; i<Input.touchCount; i++)
             {
                 TouchPosInWorld = Camera.main.ScreenToWorldPoint(Input.touches[i].position);
                 //Debug.DrawLine(Vector2.zero , TouchPosInWorld, Color.red);
 
                 if(Input.GetTouch(i).phase == TouchPhase.Began)
                 {
                     AddBodyForce();
                 }
             }
         }   
         
     }
 
     void AddBodyForce()
     {
        //Add Forces to Rigidbody in FixedUpdate
     }