Priority Target Healing Query

I’m new to the query function for the logs and was wondering if its the correct way for me to see if priority targets are getting heals at the correct times. Im trying to setup my logs to show me low health healing and topping off targets that are about to take incoming damage. I know the Wowanalyzer tool can show low health target healing so I was curious as to how I can do that from Warcraftlogs instead,

Thanks for the help.