Can, yes, should, probably not.
First, remember I'm guessing based on limited info and the pictures, so it's up to you to confirm your conditions are as I'm expecting, or tell me I'm wrong with new info we can work with.
I would recommend a two pronged approach to fix this, one, save the plant, kill the mildew.
1. Use Daconil or any other fungicide that works on PM. Note you should never use these after it starts to flower, and it's a nice additional step to wash them before flower if you use any spray on your plant.
2. Fix your grow design:
- Air Exchange - At some minimum level you must exchange air in the grow. (plants need fresh CO2, humidity needs to leave, airflow reduces mold/mildew likelihood.
- Air flow - One small fan that blows air gently around your room (may not be needed depending on exhaust fan setup)
- RH - If exchange is too slow, but temps are ok, you can just add a dehumidifier, keep it 40-50 RH in veg, 30-45 RH in flower.
- Lights - you need 5000-7500 lumens per square foot 53,750-80,625 lm/sq meter. Check your space, in veg you can be near the bottom or even a bit below those ranges, but in flower these ranges are required.