When searching, remember, a few words are better than many
ID165-Exchanging and Announcing Jokers From Your Own Rack
Question: Do I have to announce that I am doing a joker exchange from my own rack?
Answer: There is no rule that states a player must announce a joker exchange from their own rack. However, the NMJL does recommend one doing so as a courtesy.
Source: 2023 National Mah Jongg League Bulletin Q & A