PDF viewer could be an editor

Hey everyone!

I was wondering why the SiYuan in-app PDF viewer can not be used as a PDF editor.

I initially thought this feature was simply not implemented, but upon further inspection, the SiYuan PDF viewer is built on Firefox's pdf.js, with some custom styling and the SiYuan-native annotations on top.

pdf.js supports many great editing features, including freehand drawing, filing forms, moving pages, etc.

Does anyone know why these features are not exposed through the SiYuan interface, and whether there is a simple script to re-enable them?

I am considering creating a plugin if there is no such option, I could simply add a function to open the PDF in a regular pdf.js view, with all editing features enabled.

Thanks!