Yes! DocuGen currently supports subitems, but it’s limited to the first column.
For example, let’s say you have this board with one item (“This is a main item”) and three subitems (“This is the first subitem”, “Second subitem”, and “Subitem #3”):
When you click “Generate document” in DocuGen, the subitems appear as a single sequence of your subitem names separated by commas:
Note that as of this writing DocuGen does not support subitem columns (with the exception of the first column, which is supported as shown above).