You've still got one, it's just there's only one gear ratio, a pretty big reduction gear to turn the high speed motor into the speed the wheels rotate at. Pretty sure even reverse just runs the motor backwards.
But in cars a transmission is typically regarded as a device that has many gears that let you get optimal efficiency for the ICE. An electric car is more similar to a one speed bicycle in that it doesn't really shift or change gears and I wouldn't say a one speed bike has a transmission.
Arguably wheel size is a transmission if you can get more RPMs and less torque by up sizing the wheel size or obviously the reverse. Would a wheel not be a rubber gear that interfaces rotational force into the flat road for linear force? Does that make every car have multiple transmissions via the use of wheels?