Can I "chroma key" white tones to black?

[ANANAN]

Hey!

I have a drawing with lots of white paper showing through, and I want to make the white black.
The magic wand doesn't work, because the whites are undetectable and all over.

Is there a way to scan for the whitest hues of color and remove/replace it?

Thank you so much!

[Krikor]

Did you try the Select By Color Tool (Shift + C) ?
Or ➤ Colors - Color To Alpha ?