I hope you are well today and thank you for your question.
They don’t display automatically in the dropdown option.
To display them, you have to develop custom code in the child theme of Jevelin theme using the filter fw_option_type_icon_sets added in the below theme file on line number 2281
If you are not a developer then you can consider hiring a developer to develop it for you. You can hire a developer from any freelance site. Shufflehound recommends the developer https://www.upwork.com/freelancers/~011652ffec8865c