How to use in pure .md

[SamuelLHuber]

How can I use astro-seo in markdown files?

I am using Astro Starlight and would love to display custom tags defined in my Frontmatter.

For example

<meta property="fc:frame" content="vNext" />

when using Starlight to extend head I can't get it in there as in my .md

title: "My sample .md"
head:
  - tag: meta
    content: vNext

doesn't give me the equivalent as it's missing property

How would I do this with astro-seo? in .astro pages I could use the SEO component and pass the extended meta tags though I can't use components in .md files and would love to do it in frontmatter

is there a solution potentially with just pure .md? or if not then with .mdx?