In manifest v3 is conditional redirecting possible? - google-chrome-extension

Question

We have a Chrome extension that we use that allows our developers to quickly setup redirects for certain URLs, for easier debugging across different clients' sites. It currently uses manifest v2 manifest with webRequestBlocking.
In brief, it behaves something like this:
Search for a URL pattern like: https://www.example.com/c1234/path/to/javascript.js
Use the c1234 part of the matched URL in an HTTP call to a web service that to look-up the value of a variable, which we'll call shortName here.
Redirect the URL in #1 to a new URL that follows a pattern something like this: https://localhost/imp-{shortName}/javascript.js.
With the declarativeNetRequest in manifest v3, I'm able to set rules that redirect using regular expressions, but I don't see any way to use a part of the matched URL to look-up a variable from an outside source (step #2) above.
Is this not possible with manfiest v3 at all? I'm using the updateSessionRules API as follows:
chrome.declarativeNetRequest.updateSessionRules({
addRules: [
{
id: 1,
action: {
type: 'redirect',
redirect: {
regexSubstitution: '\1://localhost/{shortName}/javascript.js'
}
},
condition: {
regexFilter: '^(https?):.+(example.com).+(c[0-9]+).+javascript.+$'
}
}
];
rules,
removeRuleIds: [1]
});
In manifest v2, I used chrome.webRequest.onBeforeRequest to intercept before the request was made:
chrome.webRequest.onBeforeRequest.addListener(
function(details) {
return redirectOnMatch(details);
},
{
urls : ["<all_urls>"]
},
["blocking"]
);
The redirectOnMatch function would first check to see if the URL matched a pattern, and if it did, extract the c1234 value and use it in an HTTP call.
Is there any way to have code run and set the redirect rules before the request is made in manifest v3?