Can we change numbly behavior with a flag?

[Doom4535]

Is it possible to add a behavior type flag that numbly can pickup to change the behavior (for things such as appendixes?) something along the lines of:

= Conclusions
My conclusions

= Matlab files #:Appendix: #t
== ustep.m #:Appendix: #t
#let text = read("matlab/ustep.m")
#raw(text, lang: "matlab")

[flaribbit]

Hello, put flag in headings seems strange to me, I would suggest something like this:

#import "@preview/numbly:0.1.0": numbly
#set heading(numbering: "1.")
#outline(indent: 2em)
= Introduction
= Related Work
= Proposed Method
= Experiments
= Conclusions

#set heading(numbering: numbly("Appendix {1:A}.", "File {1:A}.{2}.")) // change numbering format of headings
#counter(heading).update(0) // reset heading counter

= Matlab files
== ustep.m
== main.m

You will get

[flaribbit]

If you have more complex requirements, you can refer to

https://typst-doc-cn.github.io/guide/FAQ/heading-various-format.html

https://typst-doc-cn.github.io/guide/FAQ/variant-heading.html