Acme: look for text in tags

Is there a way to look for text in tags?

My instinct was to type in the topmost tag, then perform a button-3
click. It did not work.

A round-about way is to execute

 <9p read acme/index

and look for it there (using plan9port, much appreciated if I can be
directed to the right place to ask if this is not). The drawback is
that this needs to be done every time the tags have changed.

At the moment, button-3 click in the topmost tag does not seem to do
anything. It would be good if it could be interpreted as looking for
text in tags, if that fits into the mechanism of the editor.

Yuning