Thinking of adding similar to this into my CadWorx library: https://www.mercerinnovation.com/product/flange-protection-system/

I've tested adding it using Thermal Isulation, or it can be as part of Gaskets/Flange description, but this is not ideal.
The best would be to have it graphically indicated in the model and Isometrics as a separate component. Anyone managed in the past ? Thanks in advance.

CADWorx doesn't have anything like that. I'd consider making part of a custom gasket myself, just for expediency. Otherwise you'll have to bugger around with pipe supports or restraints, or manually adding generic-attach created objects.