How to merge unique values for a child array when merging objects

I want to merge the .environments.default and .environments.dev objects together, so that dev values override any default values and default values fill in anything not defined in the dev object. If I use .environments.default * .environments.dev most of the objects are merged correctly, except for the array lists under the env and secrets objects. The entire dev object is used, but I want the array lists to be merged with unique values.

Is there anyway to get this result with jq? If it helps I could also try doing this in yq with the YAML file.

I would also really like to know if this is possible without hardcoding "env" or "secrets" anywhere in the code.

When I use .environments.default * .environments.dev on the below source...

Source:

{"environments": {"default": {"config": {"security": {"user": 0,"group": 0        },"resources": {"limits": {"memory": "256Mi","cpu": "500m"          }        },"env": [          {"name": "DEFAULT_ENV","value": "DEFAULT_ENV_VALUE"          },          {"name": "BASE_URL","value": "DEFAULT_BASE_URL"          }        ],"secrets": [          {"secretID": "567","mountPath": "/default/dir/to/567/path"          },          {"secretID": "123","mountPath": "/default/dir/to/123/path"          },          {"secretUUID": "789","mountPath": "/default/dir/to/789/path"          }        ]      }    },"dev": {"config": {"replicas": 1,"resources": {"limits": {"cpu": "5000m"          }        },"env": [          {"name": "BASE_URL","value": "DEV_BASE_URL"          },          {"name": "DEV_ENV_1","value": "DEV_ENV_1"          }        ],"secrets": [          {"secretID": "456","mountPath": "/dev/dir/to/456/path"          },          {"secretID": "123","mountPath": "/dev/dir/to/456/path"          }        ]      }    }  }}

I get...

Current output:

{"config": {"security": {"user": 0,"group": 0    },"resources": {"limits": {"memory": "256Mi","cpu": "5000m"      }    },"env": [      {"name": "BASE_URL","value": "DEV_BASE_URL"      },      {"name": "DEV_ENV_1","value": "DEV_ENV_1"      }    ],"secrets": [      {"secretID": "456","mountPath": "/dev/dir/to/456/path"      },      {"secretID": "123","mountPath": "/dev/dir/to/456/path"      }    ],"replicas": 1  }}

but I want...

Desired output:

{"config": {"security": {"user": 0,"group": 0    },"resources": {"limits": {"memory": "256Mi","cpu": "5000m"      }    },"env": [      {"name": "BASE_URL","value": "DEV_BASE_URL"      },      {"name": "DEV_ENV_1","value": "DEV_ENV_1"      },      {"name": "DEFAULT_ENV","value": "DEFAULT_ENV_VALUE"      }    ],"secrets": [      {"secretID": "456","mountPath": "/dev/dir/to/456/path"      },      {"secretID": "123","mountPath": "/dev/dir/to/456/path"      },      {"secretID": "567","mountPath": "/default/dir/to/567/path"      },      {"secretUUID": "789","mountPath": "/default/dir/to/789/path"      }    ],"replicas": 1  }}