How to loop through another map inside for_each loop

Terraform
1

Below is my code to create the virtual servers and snats for F5 using terraform. I am unable to figure out how i can loop thru the map of snats that inside the for_each when creating the virtual server resources…

terraform.tfvars

snats = {
“GCPTEST.abc.COM” = “10.12.14.133”
“GCPTEST-2.abc.COM” = “10.12.14.134”
}

vs-names = {
“GCPTEST.abc.COM” = “10.12.13.221”
“GCPTEST-1.abc.COM” = “10.12.13.222”
}

main.tf

creation of SNAT - using for_each

resource “bigip_ltm_snatpool” “snatpool_gcptest” {
for_each = var.snats
name = “/{var.partition}/SNAT-{each.key}_{each.value}" members = ["{each.value}”]
}

resource “bigip_ltm_virtual_server” “https” {
for_each = var.vs-names
name = “/{var.partition}/vs-{each.key}-443”
description = “Virtual server via Terraform”
source = var.internet-ip
destination = each.value
port = 443

source_address_translation  =   "snat"
snatpool =    ????? how to loop thru the snats map ???

}