How can Worker memory usage be managed ?

[inverted-capital]

In this issue #6916 the ability was added to register a callback when an isolate is under memory pressure, so it can be terminated without bringing down the whole v8 instance. How can we access this capability ?

Specifically we would like the means of running untrusted code within a Worker instance, taking advantage of the sandboxing provided by Deno, and the efficiencies in resource usage and latency afforded by v8 isolates. Thank you for this great project.