I'm pretty new to JSON.
I have a SharePoint list with employee schedules (shifts) as seen below:

My OnClock column uses the following to determine if (now) time is within the stipulated shift start and end times. This works great.
JSON
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "div",
"txtContent": "=if((Number(@now)-21600000)/1000%86400>Number(Date([$Time])-28800000)/1000%86400,if((Number(@now)-21600000)/1000%86400<Number(Date([$EndTimeNeeded])-28800000)/1000%86400,'Yes','No'),'no')"
}
However I'm having trouble since Flow does not "pick up" the value. As a matter of fact if I open an item up --> OnClock is otherwise empty ( "-" ).
Is it possible to have the value that's visually displayed actually write to the true value of the item so Flow can read it?
Thanks in advance.
