In regards to the Whills…
'George Lucas explained that he intended the Whills to be microbiotic beings who fed off the Force and controlled the entire universe. They were capable of creating certain destinies for people, such as the Chosen One prophecy. In Lucas’s view, all living things were only vessels for the Whills to travel around in, and the midi-chlorians (first introduced in the 1999 film Star Wars: Episode I The Phantom Menace) served as a conduit. “The Whills, in a general sense, they are the Force,” Lucas is quoted as saying.
Lucas claims that, had he held onto Lucasfilm Ltd. instead of selling it to The Walt Disney Company in 2012, the sequel trilogy would have featured the microbiotic world of the Whills.’
^ from https://starwars.fandom.com/wiki/Whills(community)_
Though for Rogue One… as in the ‘Guardians Of The Whills’:-
‘Everything We Know About the Whills in Star Wars’:-
https://www.youtube.com/watch?v=uivBwp1CPTc - a 4 minute video from the ‘Star Wars Explained’ youtube channel does a decent job (for me, anyway 😃)