Racers have been cooling fuel forever.
It has the benefit of lowering intake air temps which in turn lets you run more timing. In fact, I would expect in the above dyno charts that pre-mod, the ECU was pulling a small amount of timing due to intake air temp.
There are several styles available.
Design Engineering DEI 080125 - DEI CryO2 Fuel Chilling Systems - Overview - SummitRacing.com
Passive:
Flex-a-lite 4136 - Flex-a-lite Compact Fluid Coolers - Overview - SummitRacing.com
I've seen some active ones with fans too. The best placement seems to be on the return side as it's generally lower pressure.