Custom template in plug-in Wallabag

What I’m trying to do

I want to import my saved articles on wallabag + metadata like the published date as a note in Obsidian.

The builtin templates, only insert the content of the article as a note. I want to ad the published date.

Could anybody help with an example of a template?

Frontmatter variabels

| id | Wallabag ID of the article
Add this to your notes frontmatter using the wallabag_id key to make use of the ‘Delete note and remove it from synced articles cache’ command. |
| article_title | Title of the article |
| original_link | Link to the source article |
| given_url | Given link to the source page |
| created_at | Creation date of the article in Wallabag |
| published_at | When the article was originally published according to Wallabag |

Things I have tried

Reading the manual