[Feature Request] customise separator between alias and values

[StuartLittlefair]

We are monitoring the temperature of many pieces of hardware which are below zero, and the use of a dash to separate aliases and values makes it hard to read the temperatures, and easy to get confused when the temperatures are above 0. See the panel below for an example.

It would be fantastic if we could customise the separator to, for example, use a colon instead.