Worm farming produces vermiliquid (the liquid component) and vermicast (the solid component).
A google search (with the quotes) for "What is in worm tea" or "What is in vermiliquid" returns zero results. Various sites say it has lots of minerals, but that's very non-specific.
When you add miscellaneous liquids to a worm farm, depending on the design, they may seep straight through to the area tapped for vermiliquid, so you could be getting out some of what you put in (in a more or less broken down form, depending on what it was, and how long you leave it). This is reasonably obvious.
On the other hand, solid material takes time to break down, and some minerals/compounds may be largely insoluble so won't make it into the vermiliquid at all. Are there any important nutrients/compounds that plants need that don't make it into the vermiliquid (and thus would require vermicast), and if so, what are they?
Has any extensive analysis been done on what compounds are in vermiliquid, and what they can be used for?