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If you want to drive File Cache node using attributes you can try something like this

How to send multipart/form-data with this node URL Request TOP [www.sidefx.com]?
Is there any example how to do it?

I guess we just need to wait until Epic adds support for macOS. A couple of months ago, there were no animation HDAs for MH and no Linux support.
MetaHuman with Houdini is pretty avant-garde imho