Not sure if directly it could be done.
One of the indirect ways -
- Bounce rate shows the ratio of sessions that contained exactly one hit compared to the total number of sessions.
Bounce it’s a calculated metric that can be created using a filter that includes the session with 1 event only.
And then create a calculated metric with the ratio between sessions and bounces.
In CJA the concept of session goes beyond the sequence of hits collected on the website, so you should take this in account.