Spring - Ignore JSON properties in request but not in response

Question

This is a valid Entry object retrieved from a GET request http://domain/entry/{id}:

{
    "id": 1,
    "description": "ML Books",
    "dueDate": "2017-06-10",
    "paymentDate": "2017-06-10",
    "note": "Distribution de lucros",
    "value": 6500,
    "type": "INCOME",
    "category": {
        "id": 2,
        "name": "Food"
    },
    "person": {
        "id": 3,
        "name": "User",
        "active": true,
        "address": {
            // properties suppressed for better reading
        }
    }
}

In a POST request I want to save the foreing objects Category and Person just sending the respective Id's, like this:

{
    "description": "NEW ENTRY",
    "dueDate": "2019-06-22",
    "paymentDate": "2019-06-22",
    "note": "Coloured pens",
    "value": 10,
    "type": "INCOME",
    "categoryId": 5,
    "personId": 5
}

To save the objects without Spring saying the person and category objects were null, I've added @JsonIgnore to them in the model, and followed this thread.

It partially worked:

• now it saves de object just with the Id
• but not retrieves the object in GET requests

Now, when retrieving a Entry with the same GET request http://domain/entry/{id}:

{
    "id": 23,
    "description": "Pens",
    "dueDate": "2019-06-22",
    "paymentDate": "2019-06-22",
    "note": "Coloured pens",
    "value": 10,
    "type": "INCOME",
    "categoryId": null, // It supposed to bring the entire object
    "personId": null // It supposed to bring the entire object
}

PS: categoryId and personId are marked with @Transient, that's why it are null.

So as the title states, I want to ignore the properties Category and Person just in POST request (saving them), not in GET requests (retrieving them).

Any help will be welcome. Thanks in advance