curl --request POST \
  --url http://localhost:3917/ui/bar \
  --header 'Content-Type: application/json' \
  --data '
{
  "text": "<string>",
  "type": "text",
  "x": 123,
  "y": 123,
  "color": "<string>",
  "size": 123
}
'

{
  "ok": true,
  "message": "<string>"
}