I use Numerals(1) in Obsidian for this, and it works great. It's built on mathjs(2) and has things like @total functions which automatically sum all uninterrupted lines above it.
1 https://github.com/gtg922r/obsidian-numerals 2 https://mathjs.org/
1 https://github.com/gtg922r/obsidian-numerals 2 https://mathjs.org/
Yes it does. Show HN is a very small opportunity for normal ppl to talk about their things.