Excuse my mad paint skills (nothing of it is assets to be used in the final game, it's a screenshot of my previous game and... my bachelor thesis)
But I think you can get the idea?
On the right, there is a "MS Word" I'm talking about - I plan to take a screenshot of actual Word and process the image, and the left part is NVL textbox as a part of default RenPy mode.
It will be a part of the game, but it will make up the majority of the game, so to say.
And I plan to hide parts of the in-MS-Word lorem ipsum text with code-generated white rectangles, to reveal it later. Also, the "interface" of the "fictional MS Word" will be custom and actual part of the GUI, so it will have WORDS LEFT field and TIME LEFT field to interact with the player and let them know how much "action points" they have left.
Hope that makes sense!