OpenLDAP + StartTLS

I am trying to get my nextcloud instance set up with our OpenLDAP server which is using StartTLS. Googling around, I can see that there is a way to configure the system using HTTP PUTs, but I do not know how to send these URLs.

see https://docs.nextcloud.com/server/12/admin_manual/configuration_user/user_auth_ldap_api.html

Are there any examples on how to configure OpenLDAP using StartTLS using the linux command line?