The easiest way to do it
act_0123456789?fields=ads{insights.time_range({"since":"2019-03-03","until":"2019-03-03"}).time_increment(1){impressions}}
Delete .time_increment (1) if you don't want day-to-day data
You can use {} for subfields such as
act_0123456789?fields=campaigns{ads{name,insights,adcreatives{image_url}}}
you can use. and () for parameters such as; always make sure that you use fields only after options like this. () {}
act_0123456789?fields=campaigns.limit(1).time_range({"since":"2019-03-03","until":"2019-03-03"}).time_increment(1).breakdowns(country){ads{name,insights.time_range({"since":"2019-03-03","until":"2019-03-03"}).time_increment(1).breakdowns(country),adcreatives{image_url}}}
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