counting a specific string value in a collection

Hi,

I am Abhishek

I am creating a pie chart.I have created a collection in Firebase named ChartInfo and one of the field in the collection is named conversationStatus of datatype string which has values Hot,Warm or Cold.I want to count each of the values in the field and store them separately in an integer type variable and show the pie chart according to the conversationStatus.

I hope you understand the question and help me.

Greetings,

Abhishek