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The field which contains the size of image.

<textarea id="editor"></textarea>
<script>
$("#editor").kendoEditor({
    tools: ["insertImage"],
    imageBrowser: {
        schema: {
            model: {
                fields: {
                    size: { field: "Size" }
                }
            }
        }
    }
});
</script>

The name of the field.

<textarea id="editor"></textarea>
<script>
$("#editor").kendoEditor({
    tools: ["insertImage"],
    imageBrowser: {
        schema: {
            model: {
                fields: {
                    size: { field: "FileSize" }
                }
            }
        }
    }
});
</script>

Specifies the function which will parse the field value. If not set default parsers will be used.

<textarea id="editor"></textarea>
<script>
$("#editor").kendoEditor({
    tools: ["insertImage"],
    imageBrowser: {
        schema: {
            model: {
                fields: {
                    size: { 
                        field: "FileSize",
                        parse: function(value) {
                            return parseInt(value);
                        }
                    }
                }
            }
        }
    }
});
</script>