Getting data comparison between two periods through API


I am already using Insight Module in order to get the performance between two periods (request period vs previous). There’re some data which are not available like devices, browsers or cities, Theses datas are available trough UI (see screenshot) but not via API.

Is there a way theses data via API ?

Just an ‘up’ on this matter.

Through Insight, i can get the variation between two periods on some metrics but not the global.

Any chance to get the VisitsSummary in the insight module ?