How to disable CC in xml file

Hello, how can I disable the Closed Captions in an xml file where the media link is?

EG: Can I disable CC in the below xml stream file?

Can I use these commands in the xml file? - https://sdkdocs.roku.com/display/sdkdoc ... tionFields
Can I add <suppressCaptions>true</suppressCaptions>

<item sdImg="pkg:/images/SD/ReadSD.jpg" hdImg="pkg:/images/HD/ReadHD.jpg">
            <title></title>
            <description></description>
            <streamFormat>hls</streamFormat>
            <switchingStrategy>full-adaptation</switchingStrategy>
            <media>
                <streamQuality>HD</streamQuality>
                <streamBitrate>0</streamBitrate>
                <streamUrl>stream.m3u8</streamUrl>
            </media>
            <synopsis></synopsis>
            <genres></genres>
            <live></live>
</item>