How do I open an RESP account where I am both the subscriber and the beneficiary?

I am located in Canada and am trying to open an RESP account where I am both the subscriber and the beneficiary. The government of Canada website says I can open an RESP for myself here. I’ve called the 3 biggest banks I could think of — RBC, TD and wealthsimple — but they won’t allow me to list myself as a beneficiary. Does anyone have any idea how I can open an RESP account for myself where I am both the subscriber and the beneficiary?