{
"rich_text": [
{
"type": "text",
"text": {
"content": "Callout contents",
"link": null
},
"annotations": {
"bold": true,
"italic": false,
"strikethrough": false,
"underline": false,
"code": false,
"color": "default"
},
"plain_text": "Callout contents",
"href": null
}
],
"icon": {
"type": "emoji",
"emoji": "⚠️"
},
"color": "red_background"
}