How to update timepicker on another input change in dashboard

I have a dashboard with 2 inputs fields * a dropdown to choose a lookup file * a timepicker (token=timerange) Is it possible to update the timepicker tokens (earliest and latest) when i update the dropdown value? and if yes, the process: * I select a lookup file on the dropdown list * The lookup file contains 2 timestamps fields i want to use Sample of the lookup file: value,from,to something,timestamp1,timestamp2 I try to add this to input in simplexml dashboard on dropdown declaration: [| inputlookup lookup.csv | stats min(from) as from | return $from ][| inputlookup lookup.csv | stats max(to) as to | return $to ] without any results ... I also tried to make a small js file to attach on dropdown change event....no success here If you have an idea...