If you want to use the space for your cars without worry every time you drive, or walk in or out the door with a car so close to the stair, or sliding by the stair/car carrying things, your only option is looking at the interior of the house. Weigh the complication and trouble to parking outside, or with the cost of repairing your car and jamb. It may be only reframing the floor, or capturing some of the porch, or combining it with a future rework of the Kitchen, etc. Just guessing because the pictures don't show much.
Here are the dimensions of my stairs as promised!!
If you want to use the space for your cars without worry every time you drive, or walk in or out the door with a car so close to the stair, or sliding by the stair/car carrying things, your only option is looking at the interior of the house. Weigh the complication and trouble to parking outside, or with the cost of repairing your car and jamb. It may be only reframing the floor, or capturing some of the porch, or combining it with a future rework of the Kitchen, etc. Just guessing because the pictures don't show much.