All-Encompassing Dark Theme for Colourblind people? I'm totally new to android so I'm not sure if it works like this - but is there an add-on or something like that that I can get to make all app's "dark theme"?

I have a Oneplus 5 and I used the default dark theme but obviously things like Google Chrome and facebook are white backgrounds, which are very difficult for my colourblind-ness. Will I have to download add ons for every app I want in a dark theme? Or is there a sort of "all-encompassing" add-on I can get?
I believe you can go to Settings->Accessibility->Color Space Correction. Try that, and see if it solves the issue for you. I'm not colorblind, so it is kind of hard for me to see if it works as expected for you...

I got it from here

It is available since Android L, according to this site