>>42337589
It's a rushed functionality, so I'll test it more before officially adding it, but for your problem:

Download this version (based on >>42337404):
https://u.pone.rs/cUlorcWD.zip

Load the save you're interested in. Once you're inside that save, open the menu and go to:
AI Prompts -> Story Context -> Export Context
That will generate game\prompts\story.txt with the current context.

Edit that file however you want, just make sure to respect the format (you can copy-paste from previous logs, etc).
Go back to the game and press Import Context.
Then test a scene or convo and check your log, the context should now be what you placed in story.txt.