Another useless project is now unveiled, though still under development
(aren't they all, though?) ... an web-based utility for creating chesting
commands (and possibly other commands for "containers", such as creating
eqsets.)

http://tnsp.org/chester/

There are certain limitations, such as that most stacked items (e.g. "two
purple cloaks <red glow>" or such) are not supported and get discarded. Some
such items are supported, but it is probably impossible to heuristically parse
the real handle of item from stacked short description, so I won't even try.

Currently there is no option to save the definitions, but such option may
become available soon.

--
Ggr