Please consider integrating support for d2lang. It will significantly reduced the need to take screenshots and paste them into Workflowy.
Additionally, realistic algorithms can be incorporated into workflowy presentations.
Reference: https://d2lang.com
Instead of adding support just for D2, it might be better to focus on a meta-framework like Kroki, which supports D2 and a bunch other diagramming languages: Kroki!
But to be honest, despite recognizing the benefit of diagrams as “source code” over binary images, I’m not sure how well integrated a text-based diagramming language would be in Workflowy’s tree structure. To me, it feels like anything that doesn’t fit within the hierarchical text-based notes structure is better served as an embed of external content, and therefore not that different from embedding images, PDFs, etc.