Custom notification sounds for unread texts, by contact: Android 7.0

[Android Central Question]

I have custom notification sounds for text messages, both the default, and different custom sounds for of my more frequent contacts. I have my phone set up so if I have unread text messages, a default notification sound will play every five minutes until I read the texts.

What I want to know is whether or not it's possible to set a custom notification tone for unread text messages that is not a one size fits all default, but a different sound for each contact? My old phone could do this.