I searched for a long time, but could not find: where is the ‘weaverx_single_title’ formed? It is specified in the ‘content-single.php’ template, but it contains both the post title and the top meta-info. But I need to insert php-code between the post title and the top-meta.
@weaver would have to answer that one, but he is away until the end of the week.
In the mean time, if you have the plus plugin, you have the ability to define Custom meta info lines, so you could insert your content using that (Creating a top info line that includes your content plus the info line) and without needing to use PHP (depending on the content).
If you clarify what content you want to insert, we can confirm if that option would work.