I'm trying to add a <meta name="robots" content="noindex, nofollow" /> tag on selected products. In Magento 1, this is what the custom layout update on the product edit is for, so I could just reference head and use action to do that.
In Magento 2, however, it seems that I'm unable to do that. Although the same Custom Layout Update product attribute still exists in M2 and I can use referenceContainer, I'm unable to use referenceBlock, or <head>, so I don't really know how to proceed with this.
Any ideas would be greatly appreciated, I'd rather try avoid having to write a separate module just for achieving this goal if possible.
