Obviously you'd want to manually set the exposure next time, but your best bets to use your current clips are:
- Use Fix / Enhance > Lighting Adjustment with the Extreme Backlight option checked
- Playing with Exposure/Brightness/Contrast/Highlight Healing/Shadow settings of the Color Adjustment tool
- Applying one of the Gamma Correction FX and/or the NewBlue Shadows and Highlights FX
You may be able to get a watchable result from a combination of these tools, but it will take much longer to produce these clips than if the drastic color changes weren't needed.
Experimenting with different Color Presets or LUTs may also help but I don't have any recommendations for which ones to try.