Hi there, welcome to the forum!
You should check and ask @slowjo the package author for that, and maybe suggest some changes to the package?
In a nutshell, content is not intended to be manipulated.
There are other similar packages and some may well be supporting content.
Edit: I just found i-am-acro – Typst Universe and they seem to be supporting content. But this limits some functionalities, such as:
NOTE: It is not possible to sort by content. If you want to sort the arconyms by their short definition, they all need to be strings.
Could you share your particular use-case so we can provide advice?