Google docs preset default styles when opening a Markdown file from Google Drive?

I can use a Google Docs to open a Markdown file that I've uploaded to Google Drive.

However, when I do so, the font style for the headings is set to the defaults that come with a new document.

Is there a way to preset these styles that doesn't involve going through them one by one?

Suggestions I can think of, of where this might be:

• Can I override the styles for all imported documents?

• Do I need to use the API to do this?

• Is there a setting in the GUI that will do this ?

• Is there a global styles in my account somewhere that can be set?

• Can I made a template where the heading styles are already set?

• Is there some way of specifying it in a stylesheet in the markdown?

• Should I be using HTML to import it instead of markdown to accomplish this?

• etc?