Render custom react content in bitbucket.ui.pullrequest.overview.summary extension point

Hi,

I am trying to build a plugin based on the client-side-extension template project.
However, on the bitbucket.ui.pullrequest.overview.summary extension point it is only possible to use factories of a modal, button and a link. Would it be possible to add for example a custom react button there?
I have the impression that this is not possible via the provided factories. What are the alternatives to do so?

Thanks.