How to import Front Door Custom Domain Associations

Terraform Providers Azure
1

https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/cdn_frontdoor_custom_domain_association

for resource azurerm_cdn_frontdoor_custom_domain_association import

how (rest api) to get the resource id of the association id ?
/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/resourceGroup1/providers/Microsoft.Cdn/profiles/profile1/associations/assoc1