code: def rgba(rgb_tuple: TRGB, alpha: float = 1) -> str:
      """Convert RGB tuple to an RGBA string."""
      return "rgba({},{},{},{alpha})".format(*rgb_tuple, alpha=alpha)
  
imports: import enum
  from numbers import Real
  from typing import List, Tuple
label_desc: Use image node_id 1 for calling a global function with example usage: rgba(rgb_tuple, alpha) and returns: str