php: cmb2 text only metabox to display data, add 'type' => 'text_only' to use hook.

example-functions.php

add_action( 'cmb2_render_text_only', 'sch_cmb_render_text_only', 10, 5 );
function sch_cmb_render_text_only( $field_object, $escaped_value, $object_id, $object_type, $field_type_object ) {
    echo $escaped_value; //unescaped value: echo $field_object->value;
}