To change the configs we need to add some changes - Where we are importing the plugin in the same file - 
import "@databrainhq/plugin/web";

window.dbn = {
  baseUrl: SELFHOSTED_URL,
};
Assign configs in the window.dbn object. baseUrl - The base API endpoint e.g. https://api.example.com, https://yourdomain.com, etc. You may face typescript errors while assigning to window.dbn this can be resolved by adding the below code to any global d.ts file 
interface Window {
  dbn: Record<string, string>;
}