Add units option to field vertical.level method

[sandorkertesz]

Description

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.80%. Comparing base (849802d) to head (120ccd0).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1018   +/-   ##
========================================
  Coverage    81.79%   81.80%           
========================================
  Files          236      236           
  Lines        15914    15922    +8     
  Branches       768      768           
========================================
+ Hits         13017    13025    +8     
  Misses        2671     2671           
  Partials       226      226           

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