You could extend markmin, I haven't tested but this should work

def show_var(text):
    """
    Show a request var in markmin.

    example usage in markmin:
    ``x``:show_var
    """"
    return request.vars[text]

from functools import partial

MARKMINVARS = partial(MARKMIN, extra={'show_var': show_var})


Now you just need to use MARKMINVARS instead of the regular MARKMIN helper 
and you will be able to show vars. Again you need to test it because I 
haven't even tried this code.

For more see:
http://www.web2py.com/books/default/chapter/29/05#extending-MARKMIN

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