You can import end-entity or leaf certificates in your account. These non-CA certificates are listed as unapproved certificates. If new CAs are added then on subsequent scans these certificates will be re-categorized as approved certificates.
Navigate to Certificates > Monitored > New and select Import Leaf Certificate. Upload a .pem, .crt, or .cer file to import the certificates.
You can also choose to import multiple leaf certificates in the same file. All these certificates will be listed in the certificates list of the Monitored tab.