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I am also interested in this, sorry I can’t help you here but if you figure it out please do share!

Here's an example that creates a subnet in each available zone:

const zones = aws.getAvailabilityZones().zoneIds;
const subnets = zones.map((zoneId, i) => {
    return new aws.ec2.Subnet(`demo-${i}`, {
        vpcId: vpc.id,
        availabilityZoneId: zoneId,
        cidrBlock: `10.0.${i}.0/22`,
        tags: {
            Name: `demo-${i}`,
        },
    }, { parent: vpc, })
});