Measure full page size in Chrome DevTools

I've been googling for some time but haven't found any clear solution for this.

I want to measure full webpage weight / size (all doucment + scripts + fonts + styles etc.). I know the network tab in the devtools has size/content - but I want to have it summed (and not sum it every time).

I've been looking for chrome.devtools.* API but haven't found anything straight-forward.

Do you have some ideas how to achieve that?