Modify Ultimate RSI Indicator to Add Regular Divergence and Source Line Options

I want to modify the existing free TradingView indicator called "Ultimate RSI." The goal is to add regular divergence functionality without altering its current logic or functionality. Additionally, I want to modify it slightly to allow viewing different source lines, such as open, close, high, etc. The original code can be copied and adjusted as needed. The modified indicator must be fully functional on TradingView, and the freelancer should provide a guarantee against glitches or errors post-implementation.