Here is how to import fields from KMZ. If the data is converted to shapefiles you can bulk import directly into the blocks. This is the work around for KMZ
Add the KMZ to "polygons" using the import tool
this saves the geometry into the system
Select "Polygon" from the feature selection
Drag and drop or select the kmz to load it up
You will see it on the map
Click Save
Now the polygon is in the system
Create blocks from your loaded up polygons
Navigate to the blocks survey https://app.nrds.io/kilo/surveys/4474
Click Add Blocks
Enter the block name
To import the geometry scroll to the bottom - Geometry
Click copy from polygon
Select your polygon from the list
You will now see the polygon drawn on the map
Save