Parsing if-else in cue

[dcb1001]

I have a use case in which I have to parse the cue file and store the data in some custom format. For this purpose I am iterating over the cue using the *Iterator returned by cue.Value.Fields(opts...). This cue file may contain data of format

// this is a comment
a: int

if a != null {
    c: 10
}

The cue.Option doesn't have any option to iterate over if-else block. Is there a way to parse if-else block?