Рахат

import json

input_json = """
[
   {
      "title":"Мобильный Телефон Xiaomi Redmi Note 8 (6+128Gb) Global IND",
      "cost":"13.000 сом",
      "link":"www.gadget.kg/catalog/telefony/xiaomi/3337"
   },
   {
      "title":"Смарт Часы женские Bakeey H8",
      "cost":"1.800 сом",
      "link":"www.gadget.kg/catalog/gadzhety/smart-chasy-braslet..."
   },
   {
      "title":"Смарт-часы Samsung Galaxy Watch R800 46mm",
      "cost":"15.000 сом",
      "link":"www.gadget.kg/catalog/gadzhety/smart-chasy-braslet..."
   },
   {
      "title":"Смарт-часы Samsung Galaxy Watch R810 42mm",
      "cost":"14.700 сом",
      "link":"www.gadget.kg/catalog/gadzhety/smart-chasy-braslet..."
   }
]
"""

input_dict = json.loads(input_json)
search_term = 'samsung'
output_dict = [x for x in input_dict if search_term in x['title'].lower()]
output_json = json.dumps(output_dict, indent=4, sort_keys=True, ensure_ascii=False)
print(output_json)

[
    {
        "cost": "15.000 сом",
        "link": "www.gadget.kg/catalog/gadzhety/smart-chasy-braslet...",
        "title": "Смарт-часы Samsung Galaxy Watch R800 46mm"
    },
    {
        "cost": "14.700 сом",
        "link": "www.gadget.kg/catalog/gadzhety/smart-chasy-braslet...",
        "title": "Смарт-часы Samsung Galaxy Watch R810 42mm"
    }
]