I am facing a problem with reqSecDefOptParams. since reqSecDefOptParams provides data grouped by ticker->exchange->tradingClass->(list of expirations, list of strikes). When I select a expiry that is suitable for my strategy and filter a suitanble strike, that chosen strike price may not be available for the chosen expiry. Since all expirations and strikes are bundled there is no way to findout which strikes are available for which expiry.

is there a way to group strikes available for each expiry?