No. T7004 is about the content, this is about the edit summary.
We're not going to support this, I'm afraid. There are a handful of sort-of wikitext contexts (edit summaries, log entries, citations, and galleries), all of which do not support most of wikitext and many of which support almost none of it. I appreciate that this complexity is confusing and not perfect for users. However, each deviation has its reason.
For edit summaries, I think this is mostly because you cannot subsequently edit them to fix errors, so magic alteration of user input is a bad idea, and because there's a length limit which the pipe trick and other expansion statements might exceed in a way that the user couldn't tell before pressing 'publish'. I do not think that the engineering and design effort to support this use case is justifiable, sorry.