two indicators converted from TradingVIew :
Morphed Sine Wave
https://fr.tradingview.com/script/ZyfG9 ... Sine-Wave/
and
Enhanced Instantaneous Cycle Period - Dr. John Ehlers
https://fr.tradingview.com/script/G3js5 ... hn-Ehlers/
not sure how to use the latter and the first one is pretty nice