Is it possible to change the proxyUrl with the beforeRequest hook?

[PhilBookst]

Hey!

First off all thanks for this amazing package!

As the title suggests, is there any way to set the proxyUrl through the beforeRequest hook?
Ideally I'd like to do this on the beforeRetry hook but we cannot access the options object from there.

It should sort of act like a proxy rotation system - if the request fails, call a function which returns a new proxy and set it as the new proxyUrl.

Thanks!