what is best practice to watch my variable?

HI , i am refering to the TWebClientDataset and i need to

refer to the field name of the dataset , _src_dataset.Fields.Fieldname 
but when i traced it in my chrome developer console , in my watch list
i cannot seems to get the _src_dataset.Fields.Fieldname , although the
value exists , is there a best practice for us to handle or check
the value during debug time in our Chrome Developer Console ?

please refer to the image ,https://snag.gy/39rXwD.jpg

I do not know the technical details of the Chrome debugger behind this.

Does it change when you make parameter i a fixed value?