Hi,
Currently Unitex does not support output for a subgraph box. One needs add the output in a box before the subgraph.
At times this approach causes spacing problems in merge mode, i.e. sometimes there is a space between the output and the first token of the subgraph.
If the community agrees then we can have an output associated with a subgraph so that behaves like a normal box.
Regards,
Anubhav