Samurai wrote…
“To get 240 VAC at the shop, you would need to bring in the Line that isn’t already there, either L1 or L2. You would need to identify this at the circuit breaker.”
Rather than a shop 100 feet from your home. Think of a sub-panel installation. (imagine the sub-panel is the Shop out there).
When I installed my sub-panel to handle all the other “things” we have around the house, I needed to use a 50 Amp dual pole breaker. Each side of that breaker (inside) is tied to L1 (A) or L2 (B). So I have choices now on the sub-panel of 240 or 120 volt lines.