Value to Blank Out or Nullify Descriptive Flexfield (DFF) for Suppliers Import FBDI Template

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Is there any Value to Blank Out or Nullify Descriptive Flexfield (DFF) for Suppliers Import FBDI Template ?
Recently we re-configured the existing DFF's and just need to update the DFF's to use new values. So we just wanted to blank out (or) null the old values while importing using the Suppliers Import FBDI Template. If we are not passing any values in the Attribute fields, it's not making the existing fields blank.