Mobile app notifications with node red

Hello
I’m trying to set up a way to send a notification of ink level to the app. There are 4 different colors of ink and I want to have a single notification node to cover everything.

So lets say I want to send a notification when the black ink level drops below 10%.
When the black ink goes below 10, I set the msg.topic to “black” and the msg.payload is already set to “9”
I am trying to send a notification that include the msg.topic and the msg.payload - so it would be something like this…

The msg.topic ink is now at msg.payload% - to see “The black ink is now at 9%”

I can get the app to send a message in the call service node…
domain: notify
service: mobile_app_“myid”
Data: {“message”: “The ink is low”}

but I want to adjust the data so that it can be dynamic. so something like…
Data: {“message”: “The”, “message”: “{{msg.topic}}”, “message”: “ink is at”, “message”: “msg.payload”}

Where the topic is the ink color and the payload is the % it is at.

It will be much easier to help if we actually get to see what you have.