2013 – Apply a custom item template to promoted results

Hybrid search is enabled in our SharePoint search environment, where we display the federated search results of the tenant on SharePoint Online on our site search site. We display some first SharePoint results as a result block promoted in the results page. I now have to show the results of the most popular people from the results of SharePoint Online people as a result block promoted. I can display the same thing, but when I try to apply a custom item template to display the results in a promoted result block, it is not applied. It always takes the default element template.

I have tried to create site and site collection level result types, to create a query rule at the central administration level, at the site collection level, without success or luck. Is this a limitation or am I missing something?