Customize push notifications in the background


I am building an app which includes a chat functionality. I am using Firebase fcm with the capacitor/push-notifications plugin. Everything works fine, but I would like to add a profile image for each send message. I can include an image in the message but the image is then displayed with full width. When the notification is expanded this does not look good.
Is there a way to style the push notifications? Or to set the large icon?

best regards

Golo Klossek