I assume you're using a PDF, and not the image you shared? You need to set force ocr or format lines to get inline math with a PDF (for images, we just OCR everything anyways, so you don't need any settings).
We're working on improving the playground generally now - expect a big update tomorrow, which among other things will default to format lines.
Thanks for the kind words! The team was just me until pretty recently, but we're growing quickly and will be addressing a lot of issues quickly in the next few weeks.
Perfect - it works! Yes, I’m glad for all the time you’ve spent on this project: one of my ulterior goals is to make technical documentation for old systems and their programming environments accessible to LLMs, so that programming in retro computing can benefit from the advances in productivity that modern languages have. I’m sure you’ll find plenty of other user stories like that :)