Apologies on the belated response.
Please refer to DSS REST API Reference Tree -> FuturesAndOptionsSearch spec
I do not see any input parameters that would allow to limit the result set by "In The Money" or "Out Of Money" factor.
To me, intuitively, to determine if an Option is in the money at any specific point of time requires knowing the trading price of the stock at that exact point of time. However, DSS is a reference product, it does not cover realtime pricing.
Additionally, I would suggest to verify with DSS content experts as well.
Hope this helps