Hi and welcome to Visual Jforex !
Regarding the news calendar, we offer our own calendar available is Jforex platform when clicking on News menu > Live Economic Calendar. Such news events are not implemented dynamically in Visual Jforex platform so to consider this in your strategy, you have to input the related Date & Time as conditions for your pending orders.
News history events are not really stored but indeed their impact on the market can be seen on the charts, so when testing a strategy on a specific period of time, you can see the market movements obviously. I also recommend you to check our web platform which implement a nice tool in this regard: The display of the news event on the chart:

Cheers