Hi Karlton,
are you talking something like the SWAGGER api spec?
I've been slowly creating something within Postman over the past couple of years based off the information in the legacy API Explorer - but because the API version keeps on changing (plus time constraints) I haven't gotten very far.
If you know how to find it you can technically get the swagger spec files from the new API explorer for the objects they have published, e.g.: https://developer.workfront.com/res/swagger/swagger210909/attask-PROJ210909.json