Extend LDAP how should I define "OID"?

here
https://wiki.univention.de/index.php/Integration_with_UCS/Attributes

OID is explained like this:

(advanced) A unique (world wide!!) identifier for the attribute. As Univention has its own namespace of OIDs, the App Center can generate unique OIDs automatically

so what can I do if I don’t have an app but just want to expand my LDAP for an app running somewhere else?

I thought I can just modify the schema of “Nextcloud” from “/var/lib/univention-ldap/local-schema/nextcloud.schema”
and then just import it like this:

ucs_registerLDAPExtension --schema /tmp/mypackagename.schema --packagename mypackagename --packageversion
1

is this possible, as soon as I find out what OID I can use?