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Text annotation on marker for Polar Chart

Hello, I would like to add text annotation on marker for Polar Chart. As study of the Plotly documentation, there is example having x and y Data values which is shown below in example 1. So, I want to implement simple annotation on markers for Polar Chart having data values of radius and theta.

I would appreciate if someone give the solution for this topic.

Here is my code and result images below

var trace1 = {
   r: [0, 1, 2, 3, 4, 5, 6, 7, 8], 
   t: [10, 30, 20, 40, 30, 40, 60, 50],
  type: 'scatterpolar'
};
var data = [trace1];
var layout = {
  showlegend: false,
  annotations: [                                   
    {
      r: 6, 
      t: 240,
      text: 'Annotation Text',
    }
  ]
};
Plotly.newPlot('myDiv', data, layout);

annotation

Any help here how can i show text or image annotation on polar chart?

I want to show annotations using theta value?

Is this possible in plotly.js?