how to add existing image , price to an existing variant in one api call

Shopify Apps
1

I just added image to an existing variant by following json, and it is successful.

{
  "variant": {
    "id": 39794127077574,
    "image_id": 28888322375878 
  }
}

When I changed the above json into following’s, the price and option1 don’t change as you see in the response below.

{
  "variant": {
    "id": 39794127077574,
    "image_id": 28888322375878,
    "option1": "Not Pink",
    "price": "99.00"	
  }
}

Response:

{
    "variant":{
        "id":39794127077574,
        "product_id":6671769927878,
        "title":"Blue \/ 155",
        "price":"0.00",
        "sku":"",
        "position":1,
        "inventory_policy":"deny",
        "compare_at_price":null,
        "fulfillment_service":"manual",
        "inventory_management":null,
        "option1":"Blue",
        "option2":"155",
        "option3":null,
        "created_at":"2021-05-09T10:19:43+08:00",
        "updated_at":"2021-05-11T00:52:11+08:00",
        "taxable":true,
        "barcode":null,
        "grams":0,
        "image_id":28888322375878,
        "weight":"0.0",
        "weight_unit":"kg",
        "inventory_item_id":41888624378054,
        "inventory_quantity":0,
        "old_inventory_quantity":0,
        "requires_shipping":true,
        "admin_graphql_api_id":"gid:\/\/shopify\/ProductVariant\/39794127077574"
    }
}