fix: don't show unsupported formats in export command

[frostming]

Fixes #2877

Signed-off-by: Frost Ming [email protected]

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.32%. Comparing base (a86a656) to head (810631c).
Report is 104 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2888   +/-   ##
=======================================
  Coverage   85.32%   85.32%           
=======================================
  Files         106      106           
  Lines       10595    10596    +1     
  Branches     2307     2307           
=======================================
+ Hits         9040     9041    +1     
  Misses       1089     1089           
  Partials      466      466           

Flag	Coverage Δ
unittests	85.10% <ø> (+<0.01%)	⬆️

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