How to allow user to change role on profile

Hi,
I have a website. I am using this plugin and it’s very good.
There is an option for user to select his roles while registering (using multiselect).
I want this feature added to profile editing page (on user frontend)
so that the user can change his own role.
Is this possible. I have checked settings/options but I don’t think there is any option.
Is there any way to do this. I have basic knowledge of php, wordpress development. If you guide me a little. Hopefully I’ll do.
Thanks in advance for help 🙂

https://wordpress.org/plugins/wp-user-manager/