In google map, how to show continuesly label like infoWindow with marker data in flutter?

Question

I have list of vehicle gps tracking data with Latlng, time and vehicle speed with every element of list i am updating marker locatin with element Latlng, but i also want to show time and vehicle speed on marker but the infoWindow is only visible when marker tapped or infoWindow information not update on element change.

I have marker icon of car and car also rotate on rotation degree, if i create custom marker than also label of showing time and speed is also rotate, so how can it will be manage.