The ASID isn't used by CA Mainframe Application Tuner (MAT) to target an application from the Active display and you can't request the ASID in a monitor definition.
We only target the application by Jobname, Stepname, Procstepname and finally programname. We have a couple of enhancement requests to change this.
However, there is a TUNCALL parm, ASID, that you can submit via a batch measurement request, providing it the ASID and it will focus only on that ASID regardless of what the jobname or other parms are.
Here is a sample tuncall to measure an STC with ASID of 131
//TUNCALL EXEC PGM=TUNCALL
//STEPLIB DD DISP=SHR,DSN=hlq.MATRB0.LOADLIB
// DD DISP=SHR,DSN=hlq.CEESPLD
//TUNPRINT DD SYSOUT=*
//TUNIN DD *
MATB0LS MONITOR INVOKE JOBNAME(SPIBTEST) ASID(131)
As long as WLM STC 219 or 218 are up and running, you should be able to submit this request and get a measurement for the STC you want. The measurement request will be built in the GIF...