Failed to extract specific value from map object terraform

This is my main file

services_list = flatten([
  reverse(values(var.host_svc)) ])
 
}
variable "host_svc" {
  type = map(map(any))
  
}
output "aa" {
  value = local.services_list
}

This is terraform tfvars file

 host_svc = {
  accounts = {
    name = "accounts"
    pod = "3"
    cpu = "512M"
    memory = "1024M"
}
  analytics = {
    name = "analytics"
    pod = "3"
    cpu = "512M"
    memory = "1024M"
  }
}

When i am output local.services_list i ma getting whole object. i just want to fetch just name of each map object like accounts,analytics.

i have tried with list data type it works but i want to do with map ojject because i have to use different object values

You can do that much easier than you are trying:

local {
  services_list = [for k, v in var.host_svc : k]
}

Or even more easy using the built-in keys function 1:

local {
  services_list = keys(var.host_svc)
}

1 https://developer.hashicorp.com/terraform/language/functions/keys

If I understood you correctly, you want to read the names from your map. If you want to read your map keys, just use keys(map) function:

variable "host_svc" {
  type = map(map(any))
  default = {
    accounts_k = {
      name   = "accounts"
      pod    = "3"
      cpu    = "512M"
      memory = "1024M"
    }
    analytics_k = {
      name   = "analytics"
      pod    = "3"
      cpu    = "512M"
      memory = "1024M"
    }
  }

}
output "aa" {
  value = keys(var.host_svc)
}

Which will output:

  + aa = [
      + "accounts_k",
      + "analytics_k",
    ]

I used _k suffix just to differentiate between the map keys and your name key inside the internal map

In case you want to read name attribute of that map you can do:

output "aa" {
  value = [for svc in local.services_list : svc.name]
}

In case you don't want to have duplicates in that outputted list, use toset():

output "aa" {
  value = toset([for svc in local.services_list : svc.name])
}