'Django Rest custom serialize field

My models.py is as follows:

class CoinSetting(models.Model):
coin = models.ForeignKey(Coin, on_delete=models.CASCADE)
TYPES = (
        (0, "Amount"),
        (1, "Share"),
        )

    type = models.IntegerField(choices=TYPES, default=0)
    type_value = models.FloatField()

and I want to serialize it to looks like that:

"coins": [
        {
          "coin": ....
          "setting": {
            "Amount": 10.1
          }
        }
    ]

User can choose the form of sharing coin, i.e some amount of coin or percentage of some amount. Field "type" describe the form that user can choose, and field "type_value" is for insert this value (amount or percentage) to the chosen type. So:

for "Amount", the value is some integer (float field),
for "Share", the value is integer from 0 to 1 (this is percentage of amount, float field in range (0, 1)).

How can I serialize that model to get that display?

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'Django Rest custom serialize field

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