Getting info from a program token to use it in a velocity script

I remember having read in a post from @Sanford Whiteman​ that I cannot find that it was possible to call the value of a text {{my.texttoken}} from another velocity token, provided that the {{my.texttoken}} was included in the template of the email.

Am I correct?

With what velocity instructions can this be done?

Use case: creating a velocity that handles some data modifications and passing some parameters through another token so that regular human beings can change the parameters without having to update the script.

-Greg