'How to set object position at the border of spriterenderer using direction

I have a character (that pink guy) and I want to place an object on him with a given random direction.

Lets say the direction is Vector3.up, the object would be placed at the top-middle of my character.

  Vector3 dir = Random.insideUnitCircle.normalized;

        _trailMid.transform.position = transform.position + dir + (_jellyVo.SpriteRenderer.bounds.size / 2f);

I've tried many things but none worked. I would like to get some help from you guys!

enter image description here

unity3d


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