How to add custom Error Messages for DAQ Components

While working on Issue #134, I wanted to add custom warning messages so when a min or max value is equal it can be shown as an error message in debug mode.
I am not able to find where to add these error messages.
I tried to get some reference from here: plotly/dash#1403 but can't understand how I can add custom error messages or validation checks in DAQ.
Thank you for your help!