Provide an to_full_url Antlers modifier

[o1y]

Actually, it's a pretty simple requirement, but I couldn't find a good solution.

I have a link field where the editor can select an entry. Now, I want to use this URL, for example, as the canonical URL of the page. For this, I need to convert the relative URL into an absolute URL.

Currently, I have three options:

1. Use the join or ensure_left (or other string) modifiers in Antlers to combine the app URL with the entry's URL.
2. Use the link tag, but this doesn’t work with multi-site setups. For example, {{ link :to="my_link_field" absolute="true" }} will turn /en/test into https://mydomain.test/en/en/test 🫨
3. Create a custom modifier like{{ my_link_field | to_full_url }}.

Option 3 is what I'm requesting through this idea.