[improvement] CellGroup: add less vars

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #3094 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #3094   +/-   ##
=======================================
  Coverage   89.83%   89.83%           
=======================================
  Files         107      107           
  Lines        2204     2204           
  Branches      197      197           
=======================================
  Hits         1980     1980           
  Misses        193      193           
  Partials       31       31

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