Need help with creating a ramp

Hi -

I’ve been stuck on this for days trying to create a ramp in the area marked with yellow strips.

This is part of a driveway. Ive started using curvishear to create the lower portion of the ramp but I’m stuck trying to skin it and curve it to the main driveway.
I’ve tried using curviloft to skin but I keep getting ’ countours cannot be interpreted correctly’ mainly due to not knowing how to use it.

I might be overcomplicating it but i cannot see another way i can do this designing it on the drvieway face. Any help would be appreciated.

Modeling a ramp

A lot of tutorials on YouTube.