I don't recall that there is any "standard signal" for this or other functions of this nature.
I would create and execute a secondary task that would constantly monitor if the TCP is within a tolerance to the desired location. Then enable an output when it is.
Something similar to this snippet that I found in my archives:
//--------------
// CHECK ZONES
//--------------
//here() returns the current position of tToolAdj tool in world frame.
l_pHereCart=here(tToolAdj,world)
l_trHere=l_pHereCart.trsf
// You can uncomment this selections if you want to monitor
// joint position.
//Return the current arm joint position.
//l_jHereRevol=herej()
//Test zones example :
//if l_trHere.x<750 or (l_trHere.x<350 and l_jHereRevol.j1>-30)
//ZONE 1
if l_trHere.x>300 and l_trHere.y<-200
//Robot outside Zone 1
//doInZone1=false
else
//doInZone1=true
endIf
