yes actually it is! (however the Mold Wizard or Knowledge Fusion packages are required for this particular function to work as the loop command is part of knowledge fusion I'm pretty sure.)
I've attached an image of how this works.
I will warn you that the loop command can be finnicky and if not implemented with proper error checking can cause whole NX sessions to lock up or even crash entirely.
EDIT: realizing this may not be entirely what you're looking for.
you could also do something like:
if(test_a = 1) value_a else if(test_a = 2) value_b else value_c
remember when doing this that the if/then statement is read left to right and will have an end result as soon as something is true, so formatting the statement appropriately is necessary..