Hint

string|array Optional parameter. This option will show question mark next to a label. When user will mouse over, tooltip with your hint will be shown.

If you want to use placeholders you need to pass array. If you do not use placeholders, pass string for hint.

JSON - hint as an array

{
  "hint" : {
    "message" : "Message as markdown with placeholders %s %s",
    "placeholderValues" : ["placeholder 1", "placeholder 2"]
  }
}

JSON - hint as a string

{
  "hint" : "Message as markdown"
}

For message in array and when hint is type of string you can pass Markdown.

placeholderValues represents list of placeholders (string, int, float) which will be placed in message. They are useful when you have for example links in message. If you place link in placeholderValues, in translations you do not need to pass links. To place placeholder in message is used printf function. For example if you want place text placeholder in message, you must put %s in your message. Whole documentation with list of parameters you can use, you can find here.