Looping over tags/aliases instead of whole resource - terraform

Question

I'm trying to figure out a way to loop over a list of aliases for Datadog dashboards.
In 1 single dashboard I want to have multiple servers involved that will be fetched from variables.
For example:
variable "africa" {
type = map(any)
default = {
"server1" = {
alias = "server1"
hostname = "hostname1"
name = "query1"
formula_expression = "query1 * 8"
}
"server2" = {
name = "server2"
hostname = "hostname2"
name = "query2"
formula_expression = "query2 * 8"
}
"server3" = {
name = "server3
hostname = "hostname3"
name = "query3"
formula_expression = "query3 * 8"
}
}
}
resource "datadog_dashboard" "global_dashboards_africa" {
title = "Terraform - Africa"
description = "Dashboards for Global"
layout_type = "ordered"
widget {
group_definition {
title = "Quick Overview"
show_title = "true"
layout_type = "ordered"
widget {
timeseries_definition {
title = "Traffic"
title_size = "16"
title_align = "left"
show_legend = false
legend_layout = "auto"
legend_columns = ["avg", "min", "max", "value", "sum"]
request {
for server in var.africa:
formula {
alias = ${alias}
formula_expression = ${formula_expression}
}
query {
metric_query {
name = ${name}
query = "max:system.net.bytes_sent{device:bond0,host:${hostname}}"
}
}
style {
palette = "warm"
line_type = "solid"
line_width = "normal"
}
display_type = "area"
}
yaxis {
include_zero = "true"
scale = "linear"
min = "auto"
max = "auto"
}
}
widget_layout {
x = "0"
y = "5"
width = "12"
height = "5"
}
}
}
}
}
I've added for_each at the top, right after resource but it creates only 3 resources. I want to create 1 resource and in aliases - add like 50 servers with hostnames and names in specific locations.
I've tried multiple solutions but Terraform cannot help me with this.