Seasonal Cleaning Fee Pricing

I have seasonal cleaning fee increases from May 15th - Aug 31st. There’s no way for me to select these date ranges and increase the fee to match what my cleaner is charging. My booking window is 6 months out and so I have a lead time for the summer of somewhere around 90 days or more. It’s impossible for me to account for the 20% increase with a window like that while maintaining the normal fee outside of that window.

A fluctuating fee option (date ranges) would really be beneficial for me and I know other hosts face the same issue. I’m eating 20% all summer.