How i can add videowatermark in agora ui kit because i am able to add WatermarkOptions

[ankit-deligence3112]

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• Browser [e.g. chrome, safari]
• Version [e.g. 22]

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[ankit-deligence3112]

i try liked this
await client.engine.addVideoWatermark(watermarkUrl: ImagePaths.marker,
options:WatermarkOptions.visibleInPreview);
but its give error
Undefined name 'WatermarkOptions'.