This indicator is a modified version of TradingView builtin "Auto Fib Retracement".
It improves how the price is displayed with exact number instead of rounded number.
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.