SDP REST api set E-mail id(s) to notify - which field name?

SDP REST api set E-mail id(s) to notify - which field name?

Hello,

I'm creating a ticket using REST api of SDP.

Which field should I pass to set E-mail id(s) To Notify?
Also when I set field <group> it doesn't change in SDP, why?

All other fields necessary for me I can set and all is ok with them.

Thanks