"It seems so it is Samsung that does not release a widget capable of showing the data"

One of the reasons we (and probably many health professionals) have stayed with Samsung was the convenience of not needing to carry a separate pulse oximeter (e.g on an airplane trip) since the one built into the phone was more than adequate. Time to figure out what the next phones will be. Samsung is prioritizing business over public interest (in my opinion) so it is time to stop giving them money. It is the only thing that will get their attention.