Adobe analytics historical data to CJA through AEP

[gmadala]

Hello, 
I have read multiple articles and blogs regarding how to get Adobe analytics historical data into CJA.  
But I havent found any solid ones apart from https://www.fullstackanalyst.io/blog/adobe-customer-journey-analytics/web-analytics-with-adobes-cust...

Currently I do have historical data coming from adobe source connector which has its own default schema. 
Unfortunately I cannot select my custom schema since it does not have the Analytics experience template field group. 

How does one map both historical data from source connector and future data from websdk into one field ? 
Is this even possible ? For example I have page name that is coming as eVar1 from adobe analytics and pagename as web.pagedetails.pagename from websdk 
Now how do I merge these two into one field in data view? 

Has anyone tried like alternative approach where the datafeed is exported to datalake using APIs and then fed back into AEP for mapping into custom schema?

Looking forward to get some clear answers with direction that can help me set for future. 

[Josh__Stephens]

hi @gmadala - I've worked with historical backfills sent from data lake.  Mapping this data to appropriate schema path definitely gives you more flexibility so the data all ties together.

Using the AA source connector might be a quicker start, but AFAIK there's definitely drawbacks for the bigger picture.

[gmadala]

Could you please walk me through the process of connecting to datalake ? Were you using like databricks or something ? 
Also I am guessing you mapped your variables to the post processed data ?