I don't think so, unfortunately -- you'll have to make the initial call to get the topic, and then subsequent calls to grab the raw markdown. I don't think we'll be adding a way to retrieve the raw markdown at the topic level because we wouldn't have any use for it.
Markdown Callouts
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Is it possible to use markdown callouts?
[!Test] Lorem Ipsum
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No. Those are an extension, part of Readme-flavored markdown.
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Yes, I also know them from other markdown editors as well ... so had some hope but ok
Use callouts - Obsidian Help
Use callouts - Obsidian Help
(help.obsidian.md)
I guess there are now plugins or similiar alternatives available?