How to access path from Link field in Twig template of Drupal 8 Field Group

field-group-html-element--group-banner.html.twig

{# 
This is from a component based (Pattern Lab) custom Drupal theme.

_banner.twig is the actual component, a modified version of the HTML element Field Group template.
It contains a link component, the url of that is the banner_link_path variable.

The banner group contains a banner copy subgroup and it contains a Link field. 
We get the path from that link field.

It's intended to use with internal paths, have'n tried with external urls (yet).
#}

{% set banner_link_route = element.group_banner_copy.field_banner_link.0['#url'].routeName %}
{% set banner_link_params = element.group_banner_copy.field_banner_link.0['#url'].routeParameters %}
{% set banner_link_src = path(banner_link_route, banner_link_params) %}

{% include "@organisms/banner/_banner.twig" with {
  banner_link_path: banner_link_src,
} %}