I'm not aware of any specific plug-in that can add these filters, but there are some Elements add-ons that can do so. See, for example, ElementsXXL.
What exactly do you want to do. With a little bit of work, Elements can do most of what these filters can. I guess it depends on how sophisticated you want the filter to be. I suspect that for most Elements users, the Guided Edit>Depth of Field tool is sufficient.
It can't really add a specular Bokeh but you can always paint that in manually in Expert mode.