feat(sheet): export vars for sort plugin

[yuhongz]

close #xxx

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.12%. Comparing base (f49fed1) to head (c2c6bc5).
Report is 9 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2587      +/-   ##
==========================================
+ Coverage   27.06%   27.12%   +0.06%     
==========================================
  Files        1677     1675       -2     
  Lines       84765    84652     -113     
  Branches    17626    17642      +16     
==========================================
+ Hits        22938    22960      +22     
+ Misses      61827    61692     -135     

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