Currently edit summaries are still plain text, even in VE, partly due to the fact they accept a limited subset of wikitext, so that would probably need to be fixed first (T54174)

@Niharika -- is this something that you considered when you worked on edit summary pings?

In T209970#4835187, @DannyH wrote:

@Niharika -- is this something that you considered when you worked on edit summary pings?

@DannyH No, we did not consider this but I don't think this feature needs revisiting anything that's been already done. I think this will build on what we did as part of edit summary mentions.