"iconData" is not updating image.

[mailtodanish]

"iconData" is not updating image.
can you please provide a sample for icon change on close message.

apiVersion: 1,
method: "close",
iconData: {
color: "highlight",
text: "117",
image: new Blob([icon], {
type: "image/svg+xml",
}),
},
I am getting error below
{
"apiVersion": 1,
"method": "error",
"entity": "activityList",
"errors": [
{
"type": "TYPE_ICON_DATA",
"code": "CODE_ICON_BLOB_INVALID"
}
]
}