Cannot find dataprep block property names anywhere

Hello. I am using Unreal/datasmith for design visualisation purposes. My office uses Vectorworks, which is amazing for making excellent 2d plans, but only exports hideously exploded 3d models with thousands of hierarchical primitives, I need to remerge them in Unreal.

I’m trying to make an editor blueprint that automatically creates tens/hundreds of merging rules to add to a dataprep asset based on hierarchy (yes, there is no reliable way to do this using custom dataprep blocks as the ability to merge isn’t exposed, it’s wild to me).

However as pictured below, I cannot find the property names to assign values to the properties of dataprep blocks. The dataprep window has no details panel, and the custom dataprep block exposed property names don’t work, with or without spaces. Please let me know if you know where I could find the names of these properties to create dataprep actions via script. Thank you.