[stable5] fix: properly set string values in exports to escape formulas

[backportbot]

Backport of PR #2772

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 43.54%. Comparing base (0299120) to head (264ab0f).
Report is 34 commits behind head on stable5.

Additional details and impacted files

@@              Coverage Diff              @@
##             stable5    #2797      +/-   ##
=============================================
- Coverage      43.55%   43.54%   -0.02%     
  Complexity       908      908              
=============================================
  Files             78       78              
  Lines           3391     3392       +1     
=============================================
  Hits            1477     1477              
- Misses          1914     1915       +1     

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