The go-to way to run scripts in UI Builder, and therefor in Next Experience and Configurable workspaces, is by writing sys_ux_client_scripts.

Sometimes you have code that you want to re-use across sys_ux_client_scripts. In those cases you can encapsulate that code in a sys_ux_client_script_include and include it in multiple sys_ux_client_scripts. Here's how.

// Scope: my_app
const helloWorld = () => {
    console.log('Hello World');
};
return {
    helloWorld
}

const { helloWorld } = imports['my_app.MyScriptInclude']; 
helloWorld(); // Output: Hello World