Ajust size of content to TextMeshPro size

ChatBubbleController.cs

    public class ChatBubbleController : MonoBehaviour
    {
        [SerializeField] private Image           _background;
        [SerializeField] private TextMeshProUGUI _text;

        public void SetText(string text)
        {
            _text.text = text;
            _text.ForceMeshUpdate();
            UpdateSize();
        }

        private void UpdateSize()
        {
            var bounds = _text.GetRenderedValues(false);
            _background.rectTransform.sizeDelta = new Vector2(bounds.x + 0.5f, bounds.y + 0.25f);
        }
    }