Pass a string argument to a block of code from a table in org mode

I am trying to pass a string as a code block argument when using org-mode

and org-babel

. Specifically, I consider the following minimal example:

#+NAME: test
#+BEGIN_SRC python :var x="foobar"
return len(x)
#+END_SRC

| 6 | #ERROR |
#+TBLFM: @1$1='(org-sbe test)::@1$2='(org-sbe test (x ("fb")))

      

        
        
        
      

    

As you can see, the first cell is filled in correctly. However, I cannot get the second one to process correctly. I've tried various options; eg:

#+TBLFM: @1$1='(org-sbe test)::@1$2='(org-sbe test (x "fb"))
#+TBLFM: @1$1='(org-sbe test)::@1$2='(org-sbe test(x="fb"))

      

        
        
        
      

    

Any ideas?

BTW: #+CALL: test(x="fb")

Returns the expected result, i.e. 2

... It seems that the syntax for inline invocation or "table invocation" is different ... :(