Apply special theme accroding to heading label

[chxp]

Considering we have a special slide named as two-column as follows:

#let two-column-slide(body) = touying-slide-wrapper(self => {}

How could we make a section using the style of two-column in == pictures sections as follows:

= intros
== background
- items


== pictures <two-column>
It will using the two-column slide formats here

== default slide
return to the default format.

[OrangeX4]

I didn't understand the need to do that too much. We can use

#slide[A][B]

[chxp]

two-column is an example, it could also be a different theme such as a slide with special colors, a focus slide, a slide removing all header or footer, or a slide putting the image full of the slide without header.

In some text software such as emacs org-mode, the section header and the following content could be foldable. Slides such as #focus-slide[A] will fold into the section header and be invisible in an outline view as the following showed.

Temporarily, it will be useful when generating the typst code from the emacs org-mode. However, I foresee the future typst text software would also support section header folding. Thus it is convenient to define a special slide in the header by using a label rather than using #focus-slide[A].

original text

outline view

At last, an advantage of touying is automatically converting the section header into a slide with the section header.
Why not make the label of the section header more customizable?