Add Custom role from frontend using php hook

gistfile1.txt

hook name: registernewrole
Hook:
add_action( 'jet-form-builder/custom-action/registernewrole', 'register_new_user_role', 10, 2 );

function register_new_user_role( $request, $handler ) {
    // Get the role name from the form field (assuming the field name is 'role_name')
    $role_name = isset( $request['role_name'] ) ? sanitize_text_field( $request['role_name'] ) : '';

    // Get the capabilities from the form field (assuming the field name is 'select_capabilities')
    $capabilities = isset( $request['select_capabilities'] ) ? array_map( 'sanitize_text_field', (array) $request['select_capabilities'] ) : [];

    // Check if role name and capabilities are provided
    if ( empty( $role_name ) || empty( $capabilities ) ) {
        return new WP_Error( 'missing_data', 'Role name or capabilities are missing.' );
    }

    // Define a unique role key (e.g., converting role name to lowercase and replacing spaces)
    $role_key = strtolower( str_replace( ' ', '_', $role_name ) );

    // Check if the role already exists
    if ( get_role( $role_key ) ) {
        return new WP_Error( 'role_exists', 'This role already exists.' );
    }

    // Add the new role with the provided capabilities
    $result = add_role( $role_key, $role_name, array_flip( $capabilities ) );

    // Check if the role was successfully created
    if ( $result ) {
        return 'Role successfully created!';
    } else {
        return new WP_Error( 'role_creation_failed', 'Failed to create the role.' );
    }
}

gistfile2.txt

Role Capabilities in Bulk:

Read: read  
Create Posts: create_posts  
Edit Posts: edit_posts  
Delete Posts: delete_posts  
Publish Posts: publish_posts  
Edit Published Posts: edit_published_posts  
Delete Published Posts: delete_published_posts  
Edit Others' Posts: edit_others_posts  
Delete Others' Posts: delete_others_posts  
Manage Categories: manage_categories  
Moderate Comments: moderate_comments  
Upload Files: upload_files  
Edit Private Posts: edit_private_posts  
Delete Private Posts: delete_private_posts  
Read Private Posts: read_private_posts  
Create Pages: create_pages  
Edit Pages: edit_pages  
Delete Pages: delete_pages  
Publish Pages: publish_pages  
Edit Published Pages: edit_published_pages  
Delete Published Pages: delete_published_pages  
Edit Others' Pages: edit_others_pages  
Delete Others' Pages: delete_others_pages  
Edit Private Pages: edit_private_pages  
Delete Private Pages: delete_private_pages  
Read Private Pages: read_private_pages  
Manage Options: manage_options  
Edit Themes: edit_theme_options  
Activate Plugins: activate_plugins  
Install Plugins: install_plugins  
Delete Plugins: delete_plugins  
Update Plugins: update_plugins  
Edit Plugins: edit_plugins  
Install Themes: install_themes  
Delete Themes: delete_themes  
Update Themes: update_themes  
Switch Themes: switch_themes  
Manage Plugins: manage_plugins  
Update Core: update_core  
Customize: customize  
List Users: list_users  
Edit Users: edit_users  
Delete Users: delete_users  
Create Users: create_users  
Promote Users: promote_users  
Remove Users: remove_users  
Add Users: add_users  
Edit Dashboard: edit_dashboard  
Edit Files: edit_files  
Export: export  
Import: import  
Unfiltered HTML: unfiltered_html  
Unfiltered Uploads: unfiltered_uploads  
View Site Health: view_site_health  
Manage Widgets: edit_theme_options