1. edit the original editor-style.css directly (but you lose the changes with theme update)
2. If using a child theme, doing the upload of a custom editor-style.css file with the body color of text that you want
The editor styles do not inherit the actual theme styles, which is why there is a special css file for the editor view.
You could change the parent theme’s editor-style.css file if you want, but each time a theme update is done, you will have to change your colour of text back to what you want.