Transposing jq array elements (building x*y key/value pairs from x arrays of y items)

I have the following AWS CLI JSON output that contains Instance ID, IP address and some other values from my AWS tags (a list of desired FQDNs and if a proxy should be used or not):

[    [        {"InstanceId": "i-11111111111111111","ClusterName": "vpn","Ip": "192.168.0.1","FqdnList": "vpn.example.com","Proxy": null        }    ],    [        {"InstanceId": "i-22222222222222222","ClusterName": "sql","Ip": "192.168.0.2","FqdnList": "db.example.com;sql.example.com","Proxy": "nginx"        }    ],    [        {"InstanceId": "i-33333333333333333","ClusterName": "nginx","Ip": "192.168.0.3","FqdnList": "nginx.example.com;db.example.com;sql.example.com","Proxy": null        }    ],    [        {"InstanceId": "i-44444444444444444","ClusterName": "vpn","Ip": "192.168.0.4","FqdnList": "vpn.example.com","Proxy": null        }    ],    [        {"InstanceId": "i-55555555555555555","ClusterName": "nginx","Ip": "192.168.0.5","FqdnList": "nginx.example.com;db.example.com;sql.example.com","Proxy": null        }    ]]

My final goal is to use this JSON to build the list of DNS A records (for another script that populates our DNS zone), so I am trying to transpose it to something simpler such as:

{"vpn.example.com": ["192.168.0.1","192.168.0.4",    ],"nginx.example.com": ["192.168.0.3""192.168.0.5"    ],"db.example.com": ["192.168.0.3""192.168.0.5"    ],"sql.example.com": ["192.168.0.3""192.168.0.5"    ]}

or

[    {"name": "vpn.example.com","value": "192.168.0.1"    },    {"name": "vpn.example.com","value": "192.168.0.4"    },    {"name": "nginx.example.com","value": "192.168.0.3"    },    {"name": "nginx.example.com","value": "192.168.0.5"    },    {"name": "db.example.com","value": "192.168.0.5"    },    {"name": "db.example.com","value": "192.168.0.3"    },    {"name": "sql.example.com","value": "192.168.0.3"    },    {"name": "sql.example.com","value": "192.168.0.5"    }]

I've managed to remove the items that are being a proxy (Proxy != null, because their addresses are already repeated in the proxy's tag) and make an array from the FQDNs string using:

jq '  .[].[]  | select(.Proxy | . == null)  | {      Ip: .Ip,      Fqdns: .FqdnList | split(";"),    }'

Which gives:

{"Ip": "192.168.0.1","Fqdns": ["vpn.example.com"  ]}{"Ip": "192.168.0.3","Fqdns": ["nginx.example.com","db.example.com","sql.example.com"  ]}{"Ip": "192.168.0.4","Fqdns": ["vpn.example.com"  ]}{"Ip": "192.168.0.5","Fqdns": ["nginx.example.com","db.example.com","sql.example.com"  ]}

But how do I "create" rows/items for each item in Fqdns arrays?

I'm not sure it's even possible in jq.

It can easily be done in a PHP/Python script but I rather keep it "simple".

Can map()+group_by() be useful like in this SO answer? "Transposing" objects in jq