Yes, of course.
If I'm not mistaken, you'd like me to talk about the case law demonstrating that it's constitutional to recognize the authority of indigenous peoples.
The 1996 report of the Royal Commission on Aboriginal Peoples recognizes the right to self-government pursuant to section 35. The United Nations Declaration on the Rights of Indigenous Peoples also recognizes that right. The current government is going to pass legislation recognizing their right to self-determination and self-government.
Agreements on indigenous self-government have existed since 1996. Many such agreements exist in Canada, but the matter has not made its way to the Supreme Court of Canada.
A number of British Columbia court decisions recognize the constitutional validity of the agreements, including Campbell v. British Columbia and Sga'nisim Sim'augit (Chief Mountain) v. Attorney General of Canada. I would be happy to forward the information to your staff. These two decisions recognize that self-government agreements are constitutional.