If Indoor humidity measured by My ecobee is less than 65%, then send HumidityNormal action to your Alexa device
If
Thermostat indoor humidity is less than
This trigger fires every time your ecobee thermostat senses that the indoor humidity is less than a specific value you supply.
Then
sendAlexaActionByMkzense
This service from mkZense will send an action to run a routine on your Alexa device. Use it to add Voice to your Applet.
Explore more great ways to automate Alexa Actions by mkZense and ecobee