Request Type: POST
Authorization Header: Authorization: ApiKey <my_api_token>
URL: https://app.banyanboard.com/api/annotation_groups/<my_annotation_group_uuid>/annotations/
Payload:
{
"fill_color": "#ff66cc",
"top_left_x": "80.25",
"top_left_y": "210.75",
"text": "Sample Line 1\nSample Line 2\n",
"text_fontsize": 28,
"type": "text",
"z_index": 1
}