https://harcstack.org does components like this https://rakujourney.wordpress.com/2025/07/06/harc-stack-comp...

  class Counter does Component {
    has Int $.count = 0;

    method increment is controller {
        $!count++;
        self
    }

    method HTML {
        input :id("counter-$.id"),
            :name("counter"), :value($!count)
    }
  }