Honestly, that's not a use-case I thought of! Newer versions of STACK support this, but only recently (this summer) in Version 4.4.0. Released July 2022. See https://docs.stack-assessment.org/en/Developer/Development_history/
You can check your own STACK version at the bottom of the documentation home page on your server, e.g. the demo server version is at the bottom of https://stack-demo.maths.ed.ac.uk/demo/question/type/stack/doc/doc.php/
If you have a simple question with a formula, I'd be happy to add this as an example to our unit tests to maintain the functionality. Please jut email me at Edinburgh with a question you're happy to end up in github.
Chris
You can check your own STACK version at the bottom of the documentation home page on your server, e.g. the demo server version is at the bottom of https://stack-demo.maths.ed.ac.uk/demo/question/type/stack/doc/doc.php/
If you have a simple question with a formula, I'd be happy to add this as an example to our unit tests to maintain the functionality. Please jut email me at Edinburgh with a question you're happy to end up in github.
Chris