Sharepoint: How do you create a Custom Document Set with Power Automate?

[Reylin]

I understand how to create a regular document set with Power Automate. You Send an HTTP Request to Sharepoint just like this: 

Site Address at the top. Method: POST. Uri: _vti_bin/listdata.svc/Folder Path. Headers: Slug. Site Address/Folder Path/Folder Name | Document set ctype=
I've been doing it for a while. But I can't seem to make a custom document set with this method, I put in the ctype= for the custom document set, and the flow fails. 
Does anyone know how to make a custom document set with Power Automate?