Adding new dictionary to Freeradius code base

Hi, I work for Dell and I would like to add a new dictionary (attached) for Dell-specific attributes. I'm not sure how to proceed. Is this the right place to make this request? Or do I need to add it to the code base and submit a pull request? And if I do need to submit a pull request, should I make one for 3.0.x and one for 4.0.x? Thanks, Martin Belanger Dell Inc. ?