We generate new hosts externally via a script. 
the result is an XML for the import into Zabbix:
...

<host>
            <host>Hostname</host>
            <name>Displayname</name>
            <proxy>
                <name>Proxy</name>
            </proxy>
            <tls_connect>TLS_PSK</tls_connect>
            <tls_accept>
                <option>TLS_PSK</option>
            </tls_accept>
            <tls_psk_identity>PSK</tls_psk_identity>
            <tls_psk>key</tls_psk>

...
 
The import works without errors. However the PSK and the corresponding settings for the encryption are not taken over.

In version 5.0 this was no problem.

It goes only in the import, which allows an import of the encryption parameters, as in version 5.0.

This topic was also already addressed under ZBX-22887