How to import assets with its EXTN_ATTRIBUTEs using Import Installed Base Assets FBDI?

I am implementing Maintenance Asset and there is a requirement to do a initial data load.

There are 80 EXTN_ATTRIBUTEs (EFFs) configured on the Asset Overview Screen.

Here are the steps to create asset into the Maintenance Module:

1. Create Miscellaneous Transaction (Miscellaneous Receipt)
2. Edit the inducted asset and update the values in EFFs

For step 1, Inventory Transaction Import is working fine but

for step 2, Import Installed Base Assets FBDI template has only DFF support but not the EFFs.

Is there any way to update the assets in bulk using the FBDI?