You make them assign the task to you, don't just do it because it's necessary. Each task that is not part of your actual assigned job needs to be assigned to you. Every time. If they want you to do it every time it's needed, ask for them to update your job description to reflect it.

It's called a white strike because you are burying them in paperwork, but not walking off the job.

A white strike, like all strikes works because of collective action, not because of some tricky technically lol.

Okay, you've assigned me a duty. Give me exact, and I mean exact, instructions about how to complete it.

Now repeat for the thousands of tiny tasks everyone just does on their own.

If everyone does it then it works.

Sure. It means they can ask you to do other things that aren't explicitly written in the original job description. But every time they tell you to do something beyond it, you just start doing THAT exactly to the letter of the request.