Um, the transmission has an overflow valve on the bottom of the pan, you unscrew it and start filling your transmission and once it gets to the right level it comes out and its at the right level. Nothing tricky to it.
Also my service manual says that transmission pan and drain removal takes 1.3L.
2. TRANSMISSION PAN FILL
(a) Remove the refill plug and overflow plug.
(b) Fill the transmission through the refill hole until fluid begins
to trickle out of the overflow tube.
(c) Reinstall the overflow plug.
FLUID LEVEL CHECK
The fluid temperature must be between 46C (115F) and
56C (130F) to check the fluid level.
(a) Remove the overflow plug with the engine idling.
(b) Check that the fluid comes out of the overflow tube.
If fluid does not come out, proceed to step 7.
If fluid comes out, wait until the over−flow slows to a trickle and
proceed to step 8.