Passing data from theme template to Keycloak event

[Ivan St. Ivanov]

Hello,

We have a project that uses Keycloak as identity provider. There, among others, we have:

* login theme, which we use to customize our login screen
* event listener provider that reacts on `AUTHENTICATION_ACTION` events and does something with the payload

Now we need to do the following. In our theme template we need to execute a javascript library function, which would yield a JS Object. Then, upon successful login, we need to put that object in the event payload handled by our event listener.

My question is: is that possible at all? :)

Thanks,
Ivan