//Hello, I need a variable $ custom_field obtained from a text through a form, pass it to my shortcode, how to do it? I have been with this for days and could not take this variable to my shortcode . This is returning the data along with the button and the form field

function josh_admin_menu(){
add_menu_page('Forms','Form Items','manage_options','josh-admin-menu','josh_admin_menu_main','dashicons-cart');
}  add_action('admin_menu','josh_admin_menu');
  
 

function my_recent_post(){

  return ; // if I put return josh_admin_menu_main(); returns the data along with the button and the text field
 }
 add_shortcode( 'my-shortcode', 'my_recent_post' );

FULL CODE