[NTG-context] Using comma character inside chemical

Hello all, Is there a way to use comma character or semicolon character inside the chemical formula? Comma character is used as a delimiter of individual items in the formula. When is there command for example \lettertilde, is there something like "\lettercomma (\charcomma)", "\lettersemicolon (\charcomma)" and others nonalphanumerics characters (which would be used inside chemical or mathematical environment)? Emergency, we can solve as follows: \unexpanded\def\charcomma{,} \chemical{0\charcomma5\cdot, etc.} Is there is a more elegant solution? Thanx Jaroslav