I’m using DxO PL since v4 and still waiting to have this prime lens supported for optical corrections.
All the other lenses in my bag are supported except my best and most expensive one, it’s really frustrating 
As a bird photographer it’s really my most used lens and I can’t benefit from one of the first reason I bought PL a few years ago.
Although the Sony FE 600 mm f 4 is supported why is it not the case for the SE 400 mm f 2.8 ?
Not enough users ?
If it’s a matter of having the lens at your disposal I’m ready to travel to your lab for the measures, believe me (I’m living in Belgium)