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
NAMESEASONTMGPAPGUSG%RPGMPGPPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Kyrie IrvingKyrie Irving2020-21BKNBKN546.030.64.834.926.91.40.72.410.220.150.62.87.040.23.74.092.21,8861,4512573247637130140+229
StatMuse has game-level data for usage percentage going back to the 1984-85 season.