Typst: Header that changes from page to page based on state

I would like to include the current section in my header in typst. The documentation on "page" show that a header needs to be of type none, or content. If I insert something like #counter("heading"), the value as I define the header is 0, so the header stays 0 throughout.

I though I could define use show heading to create a function that updated the header when a new heading is made.

  show heading: it => {    set text(blue.darken(40%))    set page(header: grid(columns: (1fr, 3fr, 1fr),       align(left)[LeftHead],       align(center, title),       align(right)[Right Head]    ))    it  }

I however got the following error:

error: page configuration is not allowed inside of containers┌─ my_definitions.typ:81:4│81 │╭     set page(header: grid(columns: (1fr, 3fr, 1fr), 82 ││       align(left)[LeftHead], 83 ││       align(center, title), 84 ││       align(right)[Right Head]85 ││     ))│╰──────^

Is it possible to get a heading that updates?

See details above.