Presuming you meant to ping me, I'm not sure I can provide much more input

at the moment.  As I wrote, if someone is familiar with this part of the standard

I'll be happy to review a patch adding this to Eglot. 

I share with Felician a concern: if the notification can be sent from the exit-function

it's one thing, and the patch is possibly a one or two-liner.  If, OTOH, the notification

has to be sent after the didChange that follows a completion choice, then it's

probably a much more complicated change.

João

Jo~ao