startdate FROM mdl_user_enrolments

Hello!

Im trying to get data from table mdl_user_enrolments through web services. What i checked, this web service /core_enrol_get_users_courses/ is getting me pretty much required data, but i am missing some important columns like 'timestart'. I am getting startdate and enddate of course, but i want to get timestart of enrolment. It is possible from different webservice, or it is not? I cant find any usefull web service for this and i dont want to connect to moodle database from external app.

For example what i need:
SQL Query: SELECT timestart FROM mdl_user_enrolments WHERE userid = xy;

Thanks for help, much appreciated.
JK

Moodle 3.6.1 (Build: 20181205)