Offers - AJO - We can only select Event Schema in Datastream

Hi,

I am new to Adobe, have few doubts and queries related to schemas, datastream, websdk integration, Tags, XDM object mapping, AJO, Offers, Decision Management.

When selecting Mapping schema in datastream, we can only select schema created with "XDM ExperienceEvent" class not the "XDM Individual Profile" class

In Journey and offers decision doc, they mentioned we can trigger offers and journey only to schema created with "XDM Individual Profile" schema class.

But if we create datastream with mapping schema as "XDM ExperienceEvent" one, then during Tags - data elements creation - for XDM object type fields mapping, we only get schema fields for event schema but not profile schema.

I also selected profile dataset (created only for profile fields), for AEP service in datastream.

Am not sure whats the use of selecting profile dataset in datastream AEP service, when fields related to that are not displayed in Tags -XDM object mapping.

Am very confused here, how do i get the "XDM Individual Profile" schema fields in Tags - XDM object mapping ?

My main query is " how do i get both schema fields in "Tags - XDM object mapping", from schemas created with "XDM Individual Profile" class and  "XDM ExperienceEvent" class ? I need fields from both the schemas in XDM object mapping in Tags.

Below is schema with "XDM ExperienceEvent" class

Below is the schema with "XDM Individual Profile" class