Is it a way to get the "content - summary" in a twig template ?

Hi,
Trying to make a carousel, my question is "how can I use the best with the content". My idea is to split the content with === for getting easily a summary that can be the opening generic as a first slide, and the part after the `===` for the credits. The images are in page.media or in an array in the header.

Is it a way to get the end of the markdown, the content - summary or at least, to get the pure markdown of them to make the difference ?

Thanks for your suggestions.