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I looked into this here, and couldn't find a company to do a heat exchanger hookup for my pool, but also... at least here in the great lakes area, when you want to heat your pool the most is the time when your AC isn't really running (spring / fall), and you don't care about heating your pool as much when the AC is blasting. So while the pool may offer some efficiency gains to the AC, the waste heat from the AC doesn't help much with the pool.

Swimming pool temperatures in the south easily get over 85, and sometimes 90 degrees in the summer.

We always bought big blocks of ice to throw in the pool in the summer to cool it off.

It'd be somewhat custom, but there is a commercial heat exchanger (https://www.hotspotenergy.com/pool-heater/) that an HVAC tech should be able to install

I've only seen winter water heating in geothermally cooled homes.