Blog Posts Meta Description

I want to add meta descriptions to blog posts. Reviewing Custom Fields - LiveWhale Support, it looks like I should be able to add 'meta_name'=>'description' to the config to have it be used as the <meta name="{meta_name}" content="{custom field value}"/> value on details pages.

But I have been unable to get it to work. The field shows up in the backend editor just fine, and I can save text to it, but it does not create a meta description tag on the frontend.

Do I have to add something to the details template too? I tried adding <xphp var="details_custom_blogs_meta_description"/> but that didn’t do anything.

The support article specifically only mentions news/profiles/blurbs. Should this not work on blog posts too? Or am I missing something?

I should add, for now I have gotten this to work by adding a custom field to the blog editor (not the LiveWhale config). That blog custom field can be used with an XPHP variable in the template. I was just hoping to do this more globally.