How to kill programmatically a running stored procedure from XS code?

Hello,

I'm calling a stored procedure from XS Java script code.

I want to kill programmatically the execution of this SP from the XS code while the SP still running.

(IMHO - This could be done by ALTER SYSTEM CANCEL SESSION '<session_id>')

1.    How could we know programmatically what is this SP session_id ?

2.    Is there an option getting this information when executing the call, store it and using it later on for the canceling?

Thanks, Elad