feat: specify standalone port

[deependujha]

Before submitting

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• Did you make sure to update the docs?
• Did all existing and newly added tests pass locally?

What does this PR do?

Fixes # (issue).

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

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📚 Documentation preview 📚: https://lit-utilities--447.org.readthedocs.build/en/447/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@          Coverage Diff          @@
##             main   #447   +/-   ##
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  Coverage        ?    63%           
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  Files           ?     17           
  Lines           ?    740           
  Branches        ?      0           
=====================================
  Hits            ?    468           
  Misses          ?    272           
  Partials        ?      0           

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