Hi @Xia.Liu No the Eikon Data API doesn't deliver technical analysis like bollinger bands and other indicators etc. However all of these are derived from the underlying data which the Eikon Data API does deliver. Pandas has some nice built in functionality for more simple indicators such as moving averages and the like - you can see an article I wrote on that here.
There are also some very nice technical analysis packages out there in Python which are built to do various different calculations for you - even as far as recognising various candlestick patterns - so it is very easy to implement what you want to. Please check the popular TA-Lib package and the numerous other packages available. We are just about to publish an article on this - so keep an eye out for that. I hope this can help.