How to merge 2 objects based on a property value to create new object?

Please see raw dataset below:

[
    {
        "date": "2021-12-03",
        "minutes": 132.00001,
        "category": "RSVR"
    },
    {
        "date": "2021-12-03",
        "minutes": 4.95,
        "category": "DMND"
    },
    {
        "date": "2021-12-03",
        "minutes": 127.03218,
        "category": "SLIP"
    },
    {
        "date": "2021-12-04",
        "minutes": 113.97533,
        "category": "SLIP"
    },
    {
        "date": "2021-12-04",
        "minutes": 11.55,
        "category": "DMND"
    },
    {
        "date": "2021-12-04",
        "minutes": 105.30001,
        "category": "RSVR"
    }
]

Expected:
would like generate new array where:

• objects with category: 'DMND' are added as it is
• new object is created using structure (example of new object provided below):

  • {
      date: unique date from the objects with  category: 'RSVR' and category: 'SLIP'
      minutes: add minutes from category: 'RSVR' and category: 'SLIP'
      category: 'SPLY'
    }
    

    Example
    
    {
      "date": "2021-12-03",
      "minutes": 132.00001,
      "category": "RSVR"                                 {
    },                                                     "date": "2021-12-03",
    {                                            =         "minutes": 259.03219,
      "date": "2021-12-03",                                "category": "SPLY"
      "minutes": 127.03218,                              }
      "category": "SLIP"
    }
    

  (basically merging 2 objects with category: 'RSVR' and category: 'SLIP' by adding their minutes to create a new object and add that new object to the array)

New array will look like this:
[
    {
        "date": "2021-12-03",
        "minutes": 4.95,
        "category": "DMND"
    },
    {
        "date": "2021-12-03",
        "minutes": 259.03219,
        "category": "SPLY"
    },
    {
        "date": "2021-12-04",
        "minutes": 11.55,
        "category": "DMND"
    },
    {
        "date": "2021-12-04",
        "minutes": 219.275331,
        "category": "SPLY"
    }
]

Not quite sure how to go about doing this yet. any help would be appreciated