Custom with message in kitty

[Nidhogblo]

Is your feature request related to a problem? Please describe.
Hi,i wana know how i can modiffy the string of this message

Describe the solution you'd like
I wanna do a custom update to put the procces that block the close of the terminal or if exists currently this option

Describe alternatives you've considered
currently,i have the code to do this,but i wanna to incorporate it into the kitty
any information is welcome