It should be possible to allow merge fields in the Push Notification 'Title' so you can use any field value on the Work Order or Event record. Currently it is only possible in the 'Push Notification Text' field
What is the underlying problem do you intend to solve with this idea?
Make Push Notification Title more dynamic
How is the problem being addressed today, if at all?
Cram as much as possible in the 'Push Notification Text' field instead