Check messages for certain words for alert variants (Superchat)

Currently for Superchats, we can set alert variants based on amounts donated and the person who donated them. It would be great if we could have variants based on message contents. So say for example by putting in a certain word or phrase into their message, the alert sound played could change, or whatever other variation. 

YouTube specifically doesn't have any easy options for sound alerts, so having these tied to Superchat variants would be a nice workaround for this