CSV - Import Media Pool Metadata

We have created a workflow to convert ALEs to CSVs and one issue we are running into is that we only want to add Metadata to the BLANK fields.
SCENE / TAKE / SHOT / ROLL-CARD
Do not want to change File Name, Reel Name, or TimeCode - Start TC - END TC - Duration

Is there a option to lock or not update these or change the columns. I have tried using each of the 3 merge options but all of them will update the 3 TimeCode Columns.

Thanks,

Hey Resolve Support / Resolve Update Team, could you look into adding this.
Also adding the ability to lock columns so no changes happen when importing CSV.

We often order subclips from Camera raw, and it would be great to import the same Scene / Take and other Metadata Tags without doing anything destructive to TimeCode or other columns.

Thanks Guys!