It's not possible in Sage, unfortunately.
I'm sure you already know, but to use Sage in IPython, you would do this:
%load_ext sage.misc.sage_extension
For other readers, you can connect via the terminal in ipython by doing
ipython console --existing f0d951ae-9f86-4159-a427-afd9d9e72bbf
where the uuid is that of the ipython session...
>
> thanks
>
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--
William Stein
Professor of Mathematics
University of Washington
http://wstein.org