Yes. Assuming you have returned the value to IVM correctly (as per guidelines on the plug-in development page), it should now be stored as a variable.
You can then either use the 'Read out number after OGM' option in the [OGM Properties Window -> Advanced tab] to read out the variable (in either 'Digits', 'Number', 'Dollars & Cents' or 'Dollars' mode).
OR
You can go to a new OGM which has a script containing the variable (e.g. Your balance is %balvar%) and then enable the 'Use Text To Speech Voice Synthesis of Script' option also on the Advanced tab.