How do you add MarkDown webpart to a SharePoint page with it's content already filled in?

[pmatthews05]

I have the contents of a Markdown file that I wish to add to a SharePoint Page (Create and Update), no matter what I do, the content doesn't show.

I'm assuming it is possible as Add-PnpPageWebPart when selecting the property -DefaultWebPartType the MarkDown is one of the options on the intellisense.

I can create the WebPart on the page, but I'm unable to pre-populate or update the content of the MarkDown webpart.