Check out this earlier thread:
https://lists.gnu.org/archive/html/emacs-orgmode/2016-05/msg00240.html

You probably just need the org-table-mark-field definition from that.

On Sat, Dec 31, 2016, 8:28 AM Charles C. Berry <ccberry@ucsd.edu> wrote:

> On Fri, 30 Dec 2016, dmg wrote:
>
> > hi everybody,
> >
> > has anybody written a function to select the text in a cell of a table?
>
> If you mean like what ob-ref.el uses to support babel references, yes.
>
> Also see org-table.el.
>
> If you just want support for working with Babel src blocks, see
>
>         (info "(org) var")
>
> HTH,
>
> Chuck
>
> --

Kaushal Modi