Hi,
Using the methods trackState and trackAction you are able to send additional data.
Steps to perform.
To answer your query, you will need to migrate the processing rules to Analytics interface as mentioned here. As you are familiar with "props and eVars" in Analytics, you will notice that these variable names are not in the AEP 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(Analytics > Admin > Report Suites > Edit Settings > General > Processing Rules).
Set evars through processing rules.
Set events through processing rules.
Hope this helps!