how to define Subscript in text

Dear all

i want H2SO4 in btext attribute with 2  and 4 as subscript

Draft User Guide. Chapter 15.3.1 Alternative Character Set

What if you use multiple fonts in your text string:
%P to switch font
%T to switch back
%24 Font 24
For instance btext string 'H%P%242%TSO%P%244'

Hi Corrado,
I have checked the user guide it contains syntax for superscipt " ~X , Y, Z for 1, 2 , 3 " and not for subscript.
Please advice...

Or you can even create one TEXP for each letter/number and shift them up/down..

Thankiny you for alternate soultion,
can we creat  %xx font xx for subscript