Yep, that's a good command. I use it a lot.
Given this HTML:
then this JavaScript should work, provided it is the first element with that attribute:
var btnElem = document.querySelector('button[data-automation="sdk-update-grade-button"]');
btnElem.click();
Put that in a Execute a JavaScript in Front Browser action.
No guarantees of course, since I can't test it. 
Next time, if you can't provide the URL, then please provide a large block of the HTML code as text using a Forum Code Block, with "html" as the language.
Good luck.