How to send custom data in google analytics default GA4 events

I am using Google analytics in my angular project. Initially I simply added the google analytics reference in my index.html and was collecting the default event data like page_view. Recently I started sending some custom data like the type of user that logged in and the event name I am using is user_type. When I check the network tab, now I can see two types of google analytics calls. One is the calls where the event type is user_type and I can see the custom data in the payload. The second type of calls are the default GA4 events call.
My question is how can I send my custom data also in the default calls. Is that possible? Or this is the expected behaviour?