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They are Private authority certificates, already using in earlier versions of OPNsense CE. We follow:

System -> Trust -> Authorities -> Add -> Import an existing Certificate Authority and paste. Screenshots attached.

BTW, we were able to import leaf certificate successfully.

-----BEGIN CERTIFICATE-----
....
-----END CERTIFICATE-----

Importing RootCA and Intermediate, not using Private key, just the certificate.

After upgrade to v26.7.8, unable to import Private CA in trust authorities, throwing error "Only a single private key is allowed (found 0 sections)". Same works fine in earlier versions.