Filtering REST response based on child collection

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Hello Experts,

I am using REST service to find Item infomation.

https://XXXXXX.oraclecloud.com/fscmRestApi/resources/11.13.18.05/itemsV2?q=ItemNumber='218';OrganizationCode='XXXX'&expand=ItemDFF

In order to filter elements from parent collection I used q= in conjunction with Item Number and OrganizationCode.

In order to expand DFF node , I used expand=ItemDFF.

Now I want to filter data based on the ItemDFF's classification type. How to do it?

Sample shown below: I want to filter records with strategicItemFlag as Y.

 

"ItemDFF": [

                {

                    "InventoryItemId": 100000002793044,

                    "OrganizationId": 300000002124609,

                    "itemgroup": null,

                    "itemFamily": null,

                    "__FLEX_Context": "ItemClassification",

                    "__FLEX_Context_DisplayValue": "Item Classification",

                    "strategicItemFlag": "Y"