Page fields as column value

I want to display the selected pages in a pages field inside a pages section. The email field returns fine, but the trees value returns the error:

The section “champions” could not be loaded: Call to a member function toPages() on string

    columns:
        email: 
          label: Email
          value: "{{ page.email }} "
        trees:
         value: "{{ page.trees.toPages.title }}"

If I understand this correctly, you are using a pages section in table layout. And trees is a pages field in the subpages.

But this syntax does not make sense, because you cannot call title on a collection of pages. Would probably make sense to create a custom page method that returns the output you need here.