I couldn't find anything for this season, but Kyrie Irving averaged 6.0 assists per game without LeBron James in 2020-21.

kyrie irving average usage rate rebound rate assist rate without lebron james this season
Kyrie IrvingKyrie Irving2020-21BKNBKN546.030.64.834.926.,8861,4512573247637130140+229
StatMuse has game-level data for usage percentage going back to the 1984-85 season.