Thank you so much for the response. Yes, this makes perfect sense. I was actually performing some perspective corrections in the Geometry option within Camera Raw and after that, there are some empty pixels that I wanted to crop out within Camera Raw. When I commit to this within camera raw and take it back to photoshop, I can see those empty pixels are filled up with objects from my image in a random way which does not make sense (even if my content-aware fill check box is unchecked in the photoshop crop menu) and that's why I wondering how to resolve this issue.
You can mask the layer to the area you want to crop the layers image to. Crop is a document tool you can not crop a layer. You can create different size layer and clear layer pixel areas. When you use ACR to open an image or convert a Raw file or Place in a RAW Image file Image you are creating a layer. ACR as a filter you are editing an existing layer pixels. You can not crop a layer. If the Layer is a smats Object layer create by placing in a RAW object you can open the object it will open in ACR you can reprocess your RAW conversion including cropping. Photoshop will replace the smart object layer object with your changed raw conversion. If the Smart object layer object is not a RAW object ACR can be used as a smart filter it will not be able to change the smart object. It can only filter the layers pixels.