Custom Content Blocker

Hi,
i am trying to create a content blocker for the onesignal push notifications.
Onesingals loads the following script:
https://cdn.onesignal.com/sdks/OneSignalSDK.js?ver=5.9.3

What I want to get:
Block the loading of the script until the user consents.
After the users consent the javascript file should be loaded.

Any hints for that?

Thanks in advance.
Ralf