Can a registrar indicate A, MX, or CNAME type of records to domain names as technical information?

Can a registrar indicate A, MX, or CNAME type of records to domain names as technical information?

For the domain names registered by the registrar its default name servers are indicated automatically. Therefore, to the domain names managed by the registrar in the NIC database, only NS entries can be indicated. Other necessary entries can be kept in the servers of the registrar.