You can run 120v adaptor off a 4 prong, 4 wire dryer receptacle.
Only issue is that 15 or 20 amp circuit will be protected in most cases by a 30 amp breaker or bigger.
Here is my 4 prong adaptor.
So I can charge my car and work on my new rental house, which is right next to a current rental house.
The new place is a gut job, no electricity, gas, water, sewage ect.
I plug my 4 prong plug into my 30 amp charging circuit on the side of my rental house, plug in my 16 amp 240 duosida evse into the 6-15 receptacle on the left then then plug in my L14-30 to 5-20 adaptor cord (not shown) to run lights, saws, 120v air compressor, drills, dewalt battery charger ect.
The 10-50 receptacle is used to run 240v air compressor, plasma cutter and my welders, which are not being used to fix up this house.
So I run 240 and 120v loads at the same time on a 4 prong dryer circuit.