siunitx role in MyST

[jan-david-fischbach]

We already have support for units in the AST. However, we are missing an option to generate those entries from Markdown.

Proposal

I would suggest the following role syntax:

{qty}`<value>:<unit>`

where the parts in <> get replaced.

So for example:

{qty}`3:m`

For 3 meter

Additional notes

We need to make sure the role works within "math mode" as well.

[jan-david-fischbach]

#577 adresses this issue partially. I realized, that there is an existing (but crude) implementation of this role. Apart from the number format (addressed in #577) I would like to be able to enter the short form of the unit into the role (more like with siunitx).