@Andrew886 You need to talk to your own STR insurance company to see what they will cover in a rider or how your insurance will need to change in order to adequately cover you, the property and guests against damages once you have installed the pool. Do not rely on insurance from any OTA. IMO it is smoke and mirrors.
As far as your data mining, yes, it does appear that the pool will increase your income -- however, how much are you going to have to spend for maintenance? What is the cost of chemicals, water, cleaning, repairing pumps and heaters, etc. What will you have to pay for a contract with a pool company to fix things ASAP when renters are screaming? Percentage of refunds for too hot, too cold, has debris, pool guy scared me, I fell down and hurt myself, my whole family got a rash, etc. ? Food for thought.
I looked at your property (very nice!) and may I suggest that you start with a large 6+ man hot tub? Would the demographic that you are currently attracting "go" for a hot tub? You may benefit as much as the house with a pool, but with less expense.