not if you want the folder to be under public_html as you are aware that it creates in ~/domains/domain_name/public_html
assume you want bulletins.urdu.rnn.live’s document root to be at ~/public_html/admin.urdu/public/bulletins. This method does work also along with the sub_domain option that you have with the ‘create server’ option you have in virtualmin, but as Joe says the sub_domain option is not open to all .
@evanv25 refers to another thread which explains fully how to do this if the sub_domain on virtualmin server creation does not exist see here