Extending Markdown with custom plugins is mostly dependent on reliably parsing directives and mapping that data into the corresponding React component. These are implemented as block level Leaf Directives.
Container Directives with its larger capacity has the potential for richer components similar to MermaidJS, Swimlane.io and PlantUML.
Test Vimeo Embeds
::vimeo[CSM Farmers Market]{#137782295}
Test Youtube Embeds
::youtube[The Venice Photobook now available on blurb.com]{#uTpuHh58SpE}