Ensign ESPL Question

I want to create a custom symbol with Ensign ESPL, because the available choices for custom symbol types (in the Set-Up menu) is too limited for what I want to do.

What I want to do is create a custom symbol for the dollar index, as my feed IB provides each individual currency quote, but not the USDX.

The dollar index uses the following formula:

USDX = 50.14348112 ×
(1/EURUSD)^0.576 ×
USDJPY^0.136 ×
(1/GBPUSD)^0.119 ×
USDCAD^0.091 ×
USDSEK^0.042 ×
USDCHF^0.036

This formula uses powers [^]. Is it possible to create such a custom symbol with ESPL? That updates realtime from the currency quotes? If so, how would I do it?