arg in tab complete

[Shiny]

on tab complete:
if event-string is "/try":
set tab completions for position 1 to "hello" and "hi"
if arg-1 of event-string is "hello"
set tab completions for position 2 to "text" and "text"
if arg-1 of event-string is "hi"
set tab completions for position 2 to "text" and "text"

how can i do a thing like this?

 

[master_of_pooms]

on tab complete of "/try":
set tab completions for position 1 to "hello" and “hi”

You get it