I use EVgo under Nissan's free No Charge to Charge program and offer you this data point.
As you may know, the program limits rapid charging session to 30 minutes, so no problem I just use the app to start a new session immediately after the first one stops (meantime, I'm grabbing lunch or something). I did this many times with my 2018, 40 kWh LEAF and the second session significantly dropped charging levels. I'm sure some of this was from the battery limiting due to the SOC getting high around the same time and some from Rapidgate, hard to differentiate.
I've only done the 2 session charge on my 2019 Plus twice but the results are promising. So far, I am only seeing about 25% drop vs nearly 50% experienced with last years model. Here's the highlight:
*62kWh - Avg kWh
1st Session - 44.2
2nd Session - 32.5
40kWh - Avg kWh
1st Session - 31.8
2nd Session - 17.3
* Limited data set, only 2 quick charges
LEAF 2018 SV Gun Metallic (traded at odo 7350)
LEAF 2019 SL Plus Gun Metallic
5/4/19 - odo 570, SOH 99.22, AHr 175.02, Hx 103.17