Insert custom XML nodes

[xamgore]

Thanks to the docx-rust crate, it's possible to construct a complex node representing structures like images, tables, lists, etc. It would be nice to have an opportunity to put such nodes instead of text placeholders somewhere in a document. docx-template already supports it, though API is a bit clumsy.

Replacements::from_slice([
  Value::from_layout_node(MarkupNode::InRun(
    RunContent::Break(BreakType::Page.into())
  ))
]);

Even this way it is still problematic to insert new images. Image markup is sophisticated.