vnet-integration.bicep

var vnet_name = 'Your VNET name'
var subnet_name = 'Your subnet name'
var app_name = 'Your app service app name'

resource vnetConnector 'Microsoft.Web/sites/networkConfig@2020-10-01' = {
  name: '${app_name}/virtualNetwork'
  properties: {
    subnetResourceId: resourceId('Microsoft.Network/virtualNetworks/subnets', vnet_name, subnet_name)
    swiftSupported: true
  }
}