Structurally this is a long diagonal-spread: buy a call far out in time with a high delta, sell a short-dated call above the market. The long call behaves like stock at a fraction of the capital, so the position produces covered-call-like income on a much smaller outlay.
The trade-offs are real. Your long call decays, which stock does not; you collect no dividend; and if the short call goes in the money you may have to roll rather than deliver shares. The rule that keeps the structure safe is that the debit paid must be less than the width between the strikes, or the upside can turn into a loss.
Example: XYZ at $50. Buy the one-year $35 call at $16.20 (delta 0.85), sell the 30-day $55 call at $0.70. Net debit $15.50 versus the $20 strike width, so the worst case at the short strike is still profitable. The same exposure in shares would cost $5,000.
Related: diagonal-spread, covered-call, leaps, stock-replacement-strategy