No, why would you have chatgpt3 generate an outline

That's just hallucinated nonsense. It has nothing to do with what actually ranks on google.
You need outlines from real pages that are ranked #1 along with all the page 1 keywords they rank for. You need REAL data. Finetuning curie with hallucinated chatgpt data won't do anything. You could already get hallucinated output from chatgpt now.
I did a test just now with the fb ad guide page.
So, I crafted a better prompt for chatgpt, gave it the outline and this is the keywords it gave me :-
Now, if you put these into keyword.com a lot of them are actually top 3 for the page. HOWEVER..
Look at them. They aren't really like search keywords are there? They're just phrases. The ones that are top 3, are just phrases based on the outline, so naturally they do rank for the page.
Things like "tips for writing facebook ad headlines", and "facebook advertising copywriting best practices" or "writing effective facebook ad call-to-actions.
It's just taking keywords from the outline and phrasing them.
Then you have crap like
"writing impactful facebook ad visuals"
"tips for writing facebook ads for fitness and wellness"
Compare that with my fine tuned model. Even visually eyeball them
These LOOK like keywords.
Here's a further test..
If we pop the chatgpt ones in ahrefs keyword explorer we get
https://share.getcloudapp.com/v1uWKxnb
Nothing, absolutely nothing. Not a single one is even a 0-10 vol.
If we put the finetuned model's keywords in, we get
https://share.getcloudapp.com/xQuEdANX
1/3 of them have volume.
Even the other 2/3 that don't, they are "search"'ish. The chatgpt one reads more like a bunch of article titles.
So while a keyword like "good ad format for fb" doesn't appear to have volume in ahrefs, you can clearly see that it's a micro-topic you could add into the article, and the actual search term might be something like "whats a good ad format for facebook". In fact it is, that's a 0-10 vol. So that "good ad format for fb" will probably have about 10-15 0-10 vol longtail searches..
Where-as stuff like "writing impactful facebook ad visuals" or "strategies for writing killer facebook ads" are just fluffy type titles/sub-headings with lots of adjectives.
That's the thing with chatgpt. It gives you a lot of fancy adjectives and rephrases some parts of the outline, but it's not giving you actual micro-topics(ie, keywords representing microtopics) for that article.
So, you absolutely MUST when finetuning get source data from google.
That means, you search for something like "how to become a notary in Texas", then you get all the keywords on page 1, and you get the outline. You repeat that 100+ times and you fine-tune that data. Then to get more advanced you classify each page type, and you fine-tune with the classification class.