stackable switches use the gi1/0/x convention so that in case of forming a stack can become gi m/0/x where m is the switch number on the stack.
I would expect C9200L-48T-4G-E to follow this naming convention
ports on the uplink module should be named gi1/1/y.
This is another reason to have three numbers to support ports in uplink modules.
C9200L is stackable if adding the stack kit see table 4 of the datasheet
So it should use the three numbers numbering convention.
Hope to help