Input number and/or slider entity row: ability to set min/max dynamically

[osnwt]

I have the following scenario: to test proximity services I wrote a GPX tracker pyscript script which can use pre-recorded GPX file (from relive) and replay it to a device_tracker instance with original points (possibly, time-scaled) or using fixed time intervals in seconds (also with optional time scale and with position interpolation between recorded points).

When I load a GPX file, I know its duration in seconds. And I have a position seek slider to move and see the position on a map. All I need is to change input_slider max value to the length of GPX track in seconds, so slider has 100% fit to the track. And this max time can be changed also when changing speed factor (replay speed modifier).

Currently I have the only option to set input_number's max value to, say, a fixed 10000 seconds. But then the slider does not reflect the time position in GPX while seeking or playing. Would be good to be able to update max value dynamically, so the slider reflects actual value.

I haven't found any custom card which can do that for slider.