That's why people take the math subset of latex and use it in other contexts - exactly like this product.
How is this even achieved with HTML or Word?
Eg. variable width numbers like
4.53 13.98765 7 -1,000,234.76
https://imgur.com/jipZ90B
To your point, I guess that is an issue with WYSIWYG tools: if not discoverable, you assume it is not there.
That's why people take the math subset of latex and use it in other contexts - exactly like this product.