When using a Real Time Journey with a Standard Trigger, we would like to be able to reference an attribute of a related entity for that trigger.

For example, real use case:

We have a real time Journey that uses the standard Event Registration Created trigger. Within an email, we can access a lot of data on this trigger - like the related Event record. We want to create a branch that looks at a data point on that related Event record for the registration.

If Event Type, on the Event record, for that registration is XYZ, then follow Branch 1.

Right now, we only have access to the Registration data points from within a Journey/Branch. We do not have access to data points on the related records which are attributes we can see from within an email.