Two level homomorphic encryption for node by web assembly

Could this be used to grade students' notebooks in WASM on their own machines without giving away the answers?

From https://news.ycombinator.com/item?id=37786968 :

> Can the students grade their own work with containers in Crostini/Crouton//ARC without homomorpohic encryption (like Confidential Computing) running potentially signed but unknown code on their local workstations?

This with Ottergrader or nbgrader with JupyterLite would help teachers and students.

From https://news.ycombinator.com/item?id=37840416 :

> What are some ideas for UI Visual Affordances to solve for bad UX due to slow browser tabs and extensions?

How can they be sure what's using their CPU?