how to get joomla usergroup name with CB substitutions?

hi
i have a field with name "about teacher" and cutsom Html type.
i want show this field only for my teachers. each of teacher is in the different joomla user group that has teacher in usergroup name. for example teacher A is in joomla usergroup with name "course A teachers" and teacher B is in the "Art course teachers". i use CB Conditional and set as you can see in the picture attached.
i need substitutions to return joomlausergroupName to set does contain teacher.
if there is nothing substitution ti return usergroup name can you advise me?
(i can not use access level because my teacher group automaticaly created and teacher automatically add to that with Joomdle extension)

There's no substitution for grabbing every users usergroups by name. Your probably need to use a CB Code Field and the necessary Joomla API in with PHP to grab all those then condition against your code field.