Well, it’s still unfortunately not clear, but it sounds like you want to use your Premium license to create PBIRS reports to be hosted and consumed on your client’s premises … I doubt this can be done at all, and even if it could be done, I’m guessing at a minimum you’d need an identically-named and configured environment with the same data sources (schema) available so you could create the reports in your PBIRS environment and email them to the client who could then deploy them onto the client’s PBIRS environment.
BTW, PBIRS has its own specific version of Power BI Desktop that is not compatible with the Power BI Service, so both you and your client would need to be using the same version of both the PBIRS and PBIRS Desktop.
For your client to host and consume PBIRS reports on their premises they will need their own license for PBIRS, which they can get via their own Power BI Premium license of their own license for SQL Server 2017 (or later) Enterprise Edition with Software Assurance.
Greg