I would like to have custom face with Programming features.
E.g.: hours in roman numbers, hours with decimal places instead of minutes, rounding of minutes, sum of steps from last 5 days, each 3rd hour with red colour (0, 3, 6, 9, 12, 15, 18, 21), and everything what is possible by using if, else, switch, +, -, *, /, mod.
I cannot find how to use these Programming features in Json.
Can you help, or share the example, please?
Thank you