Add blocking tags to feed

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Hi, how do I add a blocking tag to one my feeds to enable it to be removed from Google Podcasts?

https://support.google.com/podcast-publishers/answer/9482981?hl=en&ref_topic=9476061

<googleplay:block>yes</googleplay:block>
<itunes:block>yes</itunes:block>

I cannot see an option in Seriously Simple Podcasting.

Thanks in advance!