creating a slur with markup

[Rachael Thomas Carlson]

Hello everyone:

I am wondering how one might create a slur with the  \markup command.  I 
am trying to create, in tabulature, two pull-offs that occur 
simultaneously in the same voice.

\version "2.16.2"

\new TabStaff {
<c' e>8\2\4 <b d>\2\4
}

I need to create a slur between both of these notes without creating two 
voices in the tabulature as that would mess up the stems and beaming 
that I am working on.

Thank you for any help that you are able to give,
Rachael