Right now, when people PDF export pages, they get nothing from dynamic macros because the content is loaded asynchronously

Here's a suggestion:

• Add flag pdfExport in the descriptor
• Use the same URL provided and invoke it the same way it's done with staticContentMacros but pass a flag or header

As a add-on developer, I'd set the pdfExport flag to true, and handle the request accordingly (i.e. plain HTML)