There is no built-in function for this. Here is one possibility for a rule file implementation.
In the rule file, use a LAYOUT TEXT statement to define a text object at (0,0).
Use an EXPAND TEXT layer operation to derive a polygon from your LAYOUT TEXT object.
Use a GROW operation with sufficient values to modify your EXPAND TEXT derived polygon so it becomes a marker for your coordinates.
Because this recipe derives a polygon, it will have a width of at least 1 dbu.
one more way to do is like, get the bounding box of the entire chip using EXTENT.
and then find the centre of the bounding box using EXTENTS <layer> CENTERS.
It will create a marker layer of size 1x1. Then grow this marker layer by a value > (chip length/width)/2
center_0= EXTENTS Bbox CENTERS
output = GROW center_0 RIGHT BY value 6000 TOP BY 6000 LEFT BY 6000 BOTTOM BY 6000 //size value could be based on die size