Yes. For each Oct Call sold, I own a 2020 Leap (with strike prices from $100 to $300). As far as the broker is concerned, owning the Leap is the same as owning the stock with regards to selling Call options.
Brokers allow options trading based on being convinced of the client’s understanding of how they work (you must apply for the ability to trade them and claim that you know what you’re doing…).
Typically, selling options requires ownership of the shares or the ability to obtain them at a favorable price. Some experienced traders with significant assets are allowed to sell Calls without being “covered” by shares or Call options/Leaps. It’s all about the brokerage protecting itself from losses and not going afoul of the SEC rules.