backgroundImage property
Field Meaning: The background image of the blended screen
Recommended value: The default value is nil, that is, no background image is set
Special Note: You need to upload the background image to "Console => Application management => Functional configuration => Content management" in advance, After the upload is successful, you can get the corresponding "Image ID", and then convert the "Image ID" to a string type and set it to backgroundImage. For example, if the "Image ID" is 63, you can set backgroundImage = "63";
Implementation
String? backgroundImage;