Being able to export a selection of frames

I would like to select certain frames on a board and export them as a PDF - instead of automatically always exporting all the frames that exist on a board. 

As an example, we have 3 workshops on a topic and we want to have all the content related to this one topic on one board. But then after the 3rd workshop I only want an export of what we did in this particular meeting. Or I have frames which were useful to have in a meeting, but are not relevant afterwards. So  now I would select e.g. 5 out of 10 and then (by right click or similiar) would choose the option to export in a pdf only the selected frames.