How to set a page so it is not indexed by webcrawlers

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We have a page which we want to set our Robots <meta> tag to noindex. Initially, we just added a line of code in the "Additional HTML Tags for HEAD Element" section of the page wrapper which inserted <meta name="Robots" content="noindex" /> for that specific page. However, we then saw that there were two Robots <meta> tags rendering in the <head>. A little more digging and I found the following line that being inserted in the template:


<meta name="Robots" content="[[?xx::x[[A16=webcrawler arguments]]x::index, follow::[[A16]]]]" />


Given how that conditional looks, it seems like there's a way to set or pass a "webcrawler argument" to this A16 tag. I haven't been able to find any documentation on this on community or KB and conversations with support didn't yield much help. Does anyone know of a way to set the value of the A16 tag so that the above line could render as <meta name="Robots" content="noindex" />?
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