Is webRequest supported?

Adding the webRequest permission to my manifest file does not give me access to the webRequest WebExtension api in my background page.

From looking at the docs, I see that webRequestBlocking is not supported, but no mention of webRequest not being supported.

I am on macOS 12.1 and Safari 15.2.

Example:

...
"permissions": [
  "<all_urls>",
  "webRequest"
]
...