code: func FindInMap(mapName string, topLevelKey Stringable, secondLevelKey Stringable) *StringExpr {
  	return FindInMapFunc{
  		MapName:        mapName,
  		TopLevelKey:    *topLevelKey.String(),
  		SecondLevelKey: *secondLevelKey.String(),
  	}.String()
  }
docs: // FindInMap returns a new instance of FindInMapFunc.