How can I get NAT GW cost based on NAT GW ID with Cost Explorer API?

[xqi-aviatrix]

The API func I should use should be GetCostAndUsageWithResourcesInput, but how can set the filter for the func input

costexplorer.GetCostAndUsageWithResourcesInput{
		Granularity: types.GranularityDaily,
		TimePeriod: &types.DateInterval{
			Start: aws.String(start),
			End:   aws.String(end),
		},
		Filter: &types.Expression{
			Dimensions: &types.DimensionValues{
				Key:    types.DimensionService,
				Values: []string{"????"},
			},
		},
		Metrics: []string{
			string(types.MetricUnblendedCost),
		},
		GroupBy: []types.GroupDefinition{
			{
				Key:  aws.String(string(types.DimensionResourceId)),
				Type: types.GroupDefinitionTypeDimension,
			},
		},
	}

Thank you