Please let me know how to observe or trigger a change in OI for a specific strike price of Nifty / Banknifty and link it with the price as well.
You can create an advanced trigger with two alerts. For example, here’s one
OpenInterest('NFO:BANKNIFTY18MAYFUT')>=1400000 && LastTradedPrice('NFO:BANKNIFTY18MAYFUT')>=26500