This is one circumstance when you’ll need to lift the front of the car, and get under it. Per normal safety precautions, use stands to support it, and never crawl under a vehicel supported by just a jack.
When you first thread the hole, do it without the washer. It may be difficult, and that’s to be expected. Since you most likely won’t have cutting oil handy, use regular engine oil or WD-40 or similar to keep the threads oiled while cutting the new threads. Continue to cut threads until you bottom out the bolt. Once they’re cut, remove the bolt, clean any debris, install the new washer and reinstall the bolt to the proper torque specs.
That would be a permanent repair.