Is there a way to access ui/session-specific data in a custom node?

[IARI]

My extension adds some ui dialog with some settings.
That data is basically a server and some user-info for another service.

This information is stored in localstorage, i.e. specific to the comfy-ui browser session.
Now I need to somehow access this information within the execution function of a custom node.
The server only should know this data when a prompt is being executed from the comfyui interface - the server shouldn't store that information.

Is there a way to send it together with the request to the prompt endpoint - maybe in extra_data?
Is there a way to somehow attach it as metadata or hidden input for a custom node?
Is there any way to send the info to the backend - without having to define an extra endpoint, that would have to at least temporarily persiste the data somehow.
How do I best go about this?

[IARI]

I have added a Pull Request that allows to add custom extra_data with prompts:
#3479

In case there is no other way to do this and the PR can be merged, I can mark this as accepted answer.

@comfyanonymous would you care to check if that is a good addition?
Apologies, I feel like the amount of activity in this repo is a bit overwhelming - I'm hoping this still gets some attention.