Plotly dash indicators number formatting

Looking to create an indicator in dash using plotly that shows deltas and the value themself. Im trying to apply formatting that would format the number to indian format i.e 15,25,285. I am trying to use the number_valueformat but it isn’t working. Any help is appreciated Thank you !

fig = go.Figure()

    mode = "number + delta",
    value = 3000,
    delta = {'reference': 35},
    delta_increasing=dict({'color': 'red'}),
    delta_decreasing=dict({'color': 'green'}),
    number_valueformat= 'fmt')