Change the values in the deploy file:
domainNames: ['example.com', 'example.ch'],
redirectUrl: 'https://some.full.url/with/complex/path?andQuery=params',
subdomain: 'tiny'will redirect tiny.example.com and tiny.example.ch to https://some.full.url/with/complex/path?andQuery=params. Only one certificate will be created using the first domain but with the corresponding SANs
yarn
cdk bootstrap
cdk deploy
NB: it only deploys in us-east-1 due to functions used and certificate validation but it could be possible to fiddle with the regions and have cross region.