In the content markdown header:

[extra]
flatio_enabled = true
osmd_enabled = true
verovio_enabled = true

Then, in the body of the Markdown content file:

{{ osmd(id=1,
        score_path="scores/bach-intervals/stacked-dims-plus-2-stave.xml") }}

{{ flatio(id=2
          score_id="60b993ca1c5fff0014c01d3d") }}

{{ verovio(id=3,
           score_path="scores/bach-intervals/stacked-dims-plus-2-stave.xml") }}

Which render as shown below.

Open Sheet Music Display:

I've had the most success and best performance with the Open Sheet Music Display score rendering.

Flat.io:

Noter that, in the case of the flat.io, you need to have uploaded your score to their service and pass not a local path as with the others, but instead a score id. One benefit of flat.io is the embedded MIDI player for all scores.

Verovio: