The best place to look is the project proposal for the Glean Dictionary as a whole.
The Outreachy internship will cover phases 2 & 3 under the plan section. It will involve interacting with our telemetry metadata (using Python) and visualizing it (using JavaScript/Node.Js and svelte)
Note the Glean Dictionary is in a very early state as of this writing: we're expecting it to evolve rapidly over the next few weeks.