How to create a Label that indicates the Future Type (or state) of something

I wonder about the best approach to create a Label that generates forward-looking classes.

Example: A customer might purchase 12 times (on different dates).

I want to assign a label that says he/she will do a next purchase (within X months) after a given event was observed. Thus, after having observed the first transaction, will this customer come back and register another transaction? If so, he/she should receive a label 'will purchase again'. Else 'will NOT purchase again'.

From what I've seen Compose always constructs labels using all events up until (but excluding) another event (for which the label is then set). So I wonder how to generate a label for the last transaction observed in the above example. The 12th transaction is the last recorded and thus we would label a 'will NOT purchase again' here as we know the customer will not transact again.

The overall goal is to identify customers who are most likely to re-engage. Maybe there is also a more suitable modeling approach to this.