Hi,
Using the methods trackState and trackAction you are able to send additional data.
See sample iOS-Swift sample, the documentation exists for Objective-C and Android as well
Add Adobe Analytics
It appears that you are familiar with "props and eVars" in Analytics, you will notice that these variable names are not in the SDK. All key/value data coming from the SDK will be sent as contextData variables , and as such will need to be mapped to props or eVars (or other variables) by using Processing Rules in the Analytics UI.
Regards,
Jen