Custom ContextMenu for SpreadsheetView RowHeader/ColumnHeader

[JakobTernes]

Hi!
I would like to use the SpreadsheetView as an Editor for a CSV file.
It's really convenient that it is possible to override getSpreadsheetViewContextMenu s.t. custom options can be defined:
https://github.com/controlsfx/controlsfx/blob/f6f990b581be630eebed0f056ef3032436b80891/controlsfx/src/main/java/org/controlsfx/control/spreadsheet/SpreadsheetView.java#L2137C4-L2143C57

I would like to do the same for the RowHeader/ColumnHeader. However I found no methods to modify the ContextMenu of the headers and after further inspection I came to the conclusion that these ContextMenus are probably not accessible. Is that correct?
Is there a way to customize the ContextMenus for the headers? To clarify, it would be really nice to be able to add options to the ContextMenus of the Headers to have options like in Google Sheets for example, especially for deleting and adding columns/rows.

Cheers