Hi @jthi and @MathStatChem ,
Yes, I am familiar with this way -- it's just tedious and slow. It would be nice if JMP supported LaTex or extended HTML formatting to accommodate a more efficient way to write out different or more complicated super- and sub- scripted text. Even doing it the Unicode way in JSL doesn't actually get what I want -- but it's closer than not doing it.
For example,
"\!U0394\!U1D00\!U0299\!U1D04"
will produce this:

which is close, but technically not the same as: ΔABC -- the "ABC" is just small, not truly subscripted in JSL. And, having to search for each letter manually is cumbersome. You can do something like this: hinitial in JSL, the JSL code for it would be
"h\!U1D62\!U2099\!U1D62\!U209C\!U2090\!U2097"
which gives:

which works for lower case subscripted Latin letters, but it doesn't work to have capital letters as true subscripts.
Anyway, the process is tedious and does not allow for efficient or compact JSL scripting. It would be great and helpful if JSL expanded their markup capabilities with HTML since they already have things set up for bold, italic, and underline.
So in answer to my previous query about any kind of workaround to have capital letters as true subscripts, the answer so far is no in JSL. Unicode also doesn't have any values to represent a true subscripted capital letter, so using a Unicode value is not possible.

It would be nice to have this capability in JMP/JSL, that's all I'm saying....
Thanks!,
DS