Customize control to output arbitrary content or HTML.

custom-content-example.php

$wp_customize->add_setting( 'example-control', array() );

$wp_customize->add_control( new Prefix_Custom_Content( $wp_customize, 'example-control', array(
	'section' => 'title_tagline',
	'priority' => 20,
	'label' => __( 'Example Control', 'govpress' ),
	'content' => __( 'Content to output. Use <a href="#">HTML</a> if you like.', 'textdomain' ) . '</p>',
	'description' => __( 'Optional: Example Description.', 'textdomain' ),
) ) );

custom-content.php

if ( class_exists( 'WP_Customize_Control' ) && ! class_exists( 'Prefix_Custom_Content' ) ) :
class Prefix_Custom_Content extends WP_Customize_Control {

	// Whitelist content parameter
	public $content = '';

	/**
	 * Render the control's content.
	 *
	 * Allows the content to be overriden without having to rewrite the wrapper.
	 *
	 * @since   1.0.0
	 * @return  void
	 */
	public function render_content() {
		if ( isset( $this->label ) ) {
			echo '<span class="customize-control-title">' . $this->label . '</span>';
		}
		if ( isset( $this->content ) ) {
			echo $this->content;
		}
		if ( isset( $this->description ) ) {
			echo '<span class="description customize-control-description">' . $this->description . '</span>';
		}
	}
}
endif;