I have not yet seen any rumors that Cristiano Ronaldo is interested in going to Bayern Munich. He joined Manchester United last season. It doesn't seem credible to me that he will leave United this season. However, if Ronaldo comes to Bayern Munich, I don't think he will be able to get along well with Lewandowski. Lewandowski has long been one of Bayern Munich's most important players. He certainly does not want to lose his position.
News reports said that Ronaldo's representatives contacted Bayern because Ronaldo was not happy with the situation at Manchester United and wanted to win trophies, but Bayern were quick to turn down the offer, citing too high wages as the reason. I don’t know how true this is, because Ronaldo himself said that he had no negotiations with Bayern or with any other club.
And Lewandowski has already managed to say that Ronaldo will not be able to fully replace him, to which Ronaldo replied that he never replaces anyone. There have correspondence skirmishes between the players. I think Ronaldo would be a great striker for Bayern, but he is no longer young, and this can prevents for his future transfers.