Dynamic Hashtag of the Timeline


I need to embed the Timeline widget into many pages of a conference site. For different paper, there are various IDs for them,such as A, B, C…
So the question is how can I get a dynamic hashtag setting. Now, I can only make a widget combined a fixed hashtag in my account, such as #A.
And it cannot change automatically to #B or #C. Is there any way to use a variable in the widget script?