He wanted to have the value displayed to help him with his trades.
As I do not trade Forex, I do not know the co-relation of $EVZ with Forex currency pairs and wrote the script only on his request. Perhaps other Forex traders who understand $EVZ and Forex may also benefit from this script.
All the best to all.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.