I finally got it after adding a total of 1.4 L of transmission fluid. I had a few drops of fluid and because I am not sure I am perfectly leveled in my driveway I stopped there. Maybe 2 or 3 degree inclination. I used car ramps under the rear wheels to make it as level as possible. Can't be sure it is 100% level.

 

Close enough, check it again in a month!

 

Just out of curiosity what would approximatively be the amount needed after it has started to drip a couple of drops ? Can you add 250, 500 ml ?

 

Once the overflow shows signs of full (dripping) add no more.
Of course this all comes down to the car being level.
That being said, you can add as much fluid as you want but you run the risk of damage.

 

Warm it up, park it on level ground, idling in park, block both sides of the tires. Remove the little plug and if nothing is coming out add a little until transmission fluid drips out. Put the plug back in, 9 ft/lbs of torque.