Login with dynamic assets in a custom theme using React

Hi, I’m implementing Keycloak to use in authentication of an application where the clients can customize the login page like in a “white label”, adding a image to logo, defining the main collors and setting the background. This customizations are loaded by the subdomain created. All users are in the same Realm.
I would like If it’s possible to send the informations of customization using the lib keycloak-js, or have other possibility to make this customization. I already tried to get the back URI to load the data to customize, but without success. Thank you for any help!