[Theme Horse Support Team]

Hi Sébastien,

Yrs, If you select the WordPress post page than you blog large image will be displayed. Blog image large is the theme default blog. In blog image large and blog image medium, all the content is extracted from excerpt so excerpt only supports plain text. So to add hyperlinks you need to choose blog full content template. Otherwise it needs code customisation and need to hire a developer.
First create a child theme and then only customise the code so that while updating to new version your customised code will not loss. Otherwise you need to add the customised code manually.

Thank you!