I did some testing with OpenAPI modules myself as I found swagger nodes that I thought may have been useful in Node-Red, probably not enough to do a Propper evaluation though as I abandoned trying to make farmOS fit these nodes in favour creating nodes specifically for farmOS. farmOS, NodeRed, Home Assistant etc - #27 by Farmer-Ed
The very first thing Postman does when you try to load the schema json is read the schema type from the first line in the json so it fails immediately as its an unrecognized type. Perhaps some sort of plugin/addon is available or could be made to add extra schema?
I’ve been aware of this feature for a while, there are a few other similar tools out there, but I find Node-Red has the biggest community support.