Does 'Joker' Exist in a Scorsese-Verse of Films?

Joker Movie detail: 

In Gotham City, mentally-troubled comedian Arthur Fleck is disregarded and mistreated by society. He then embarks on a downward spiral of revolution and bloody crime. This path brings him face-to-face with his alter-ego: "The Joker".

Director: Todd Phillips

Writers: Todd Phillips, Scott Silver

Stars: Joaquin Phoenix, Robert De Niro, Zazie Beetz