iOS Content Blocking - How to block specific keyword on Google Images

I'm working on an iOS Content Blocking app but for some reason when you search a keyword in google images It will go through. Anyone know how to solve this?


Here's an example of a JSON Rule:


{

"action": {

"type": "block"

},

"trigger": {

"url-filter": ".*example.*",

"resource-type": ["image", "style-sheet", "document"]


}

}