Hi ,  I have below jsonb blob which i wanted to update subset value.

{
  "preference": {
    "android": {
      "software_update": "true",
      "system_maintenance": "true"
    },
    "ios": {
      "software_update": "true",
      "system_maintenance": "true"
    }
  }
}

how to i update only "android" blob which is inside "preference"
can someone help here with sqlalchemy query?
the following snippet doesnt worked for me

app_name = 'android'
pref = {"software_update": "false", "system_maintenance": "false"}

qu = session.query(SystemSubscription).filter(SystemSubscription.username == 
't...@gmail.com').update(
    {SystemSubscription.preference: cast(
        cast(SystemSubscription.preference[app_name], 
JSONB).concat(func.jsonb_build_object(app_name, json.dumps(pref))),
        JSON)}, synchronize_session="fetch")

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