JavaScript/jQuery Diagram - pageSize.items

$(function() {
    $("#diagram").dxDiagram({
        viewUnits: "cm",
        units: "cm",
        pageSize: {
            width: 21,
            height: 29.7,
            items: [
                { text: "A4 (21cm x 29.7cm)", width: 21, height: 29.7 },{ text: "A3 (29.7cm x 42cm)", width: 29.7, height: 42 }
            ]
        },
    });
});

<dx-diagram #diagram id="diagram" units="cm" viewUnits="cm">
    <dxo-page-size 
        [width]="10" 
        [height]="10"
        [items]='[{ text: "A4 (21cm x 29.7cm)", width: 21, height: 29.7 },
                  { text: "A3 (29.7cm x 42cm)", width: 29.7, height: 42 }]'>
    </dxo-page-size>
</dx-diagram>

<template>
<DxDiagram
    id="diagram"
    ref="diagram"
    units="cm"
    viewUnits="cm"
>
    <DxPageSize
    :width="10"
    :height="10"
    :items="[{ text: 'A4 (21cm x 29.7cm)', width: 21, height: 29.7 },
                    { text: 'A3 (29.7cm x 42cm)', width: 29.7, height: 42 }]"
    />
</DxDiagram>
</template>

<Diagram id="diagram" ref={this.diagramRef} units="cm" viewUnits="cm">
<PageSize width={10} height={10} items={[{ text: 'A4 (21cm x 29.7cm)', width: 21, height: 29.7 },
    { text: 'A3 (29.7cm x 42cm)', width: 29.7, height: 42 }]}/>
</Diagram>