Make a replace at the content

function lamvt_wrap_content($content) {

		$content .='';
//add your filter here

		return $content;
	}
	add_filter('the_content','lamvt_wrap_content', 99);

Or you can use
/*Support https://lamvt.vn*/
add_action( ‘pre_amp_render_post’, ‘lamvt_amp_add_custom_actions’ );
function xyz_amp_add_custom_actions() {
add_filter( ‘the_content’, ‘lamvt_amp_add_custom_actions’ );
}

function lamvt_amp_add_custom_actions( $content ) {
/*your action here*/
return $content;
}