Correlate server side custom transactions with apm rum custom Spans

[lluishi93]

Hi there.

We've a Nuxt app, where we can execute code both in the back and the frontend. We'd like to create a single custom transaction with spans being added both in the front and the backend. I've been trying to save the ensureParentTransaction id, but there was no success.

Any idea or guide on how to do this? Thanks in advance.