canEditCell and startEditingNew with initialValues

Hi,
my goal is to disable some of the cells in the newly created row using using ListGrid.startEditingNew(Map) method. I am overriding canEditCell(int, int) method. The decision on which cells should be disabled for editing is based on the combination of the field and some of the initial values.

I am able to access record using getEditedRecord but this record only reflects values changed by the user during editing. Is there please any nice way how to access initial values passed originally to the startEditingNew method at this point?

Thank you for any hint

Best

Lukas