I think the closest things done related to planes is References are not preserved after imports · Issue #1010 · Slicer/Slicer · GitHub which was prior to markups refactor, but includes work for a vtkMRMLMarkupsPlanesNode.cxx.
Related topics
Topic | Replies | Views | Activity | |
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New Annotation for Slicer - Splines and Planes | 6 | 987 | September 9, 2018 | |
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A user's proposal for Markups Module enhancements | 20 | 1667 | August 16, 2018 | |
Markups module confusion - suggestions to improve | 5 | 453 | June 18, 2020 | |
Generate a plane through the markups | 12 | 4214 | July 23, 2018 |