Terraform: Create tfvars from local values

I have a data structure like the following:

locals {
  replication_tasks = {
    track_to_s3_live = {
      replication_task_id       = "track-to-s3"
      migration_type            = "full-load-and-cdc"
      replication_task_settings = file("files/s3_tracking_cdc_settings.json")
      table_mappings            = file("files/s3_tracking_table_mappings.json")
      source_endpoint_key       = "source"
      target_endpoint_key       = "s3_tracking"
    }
  }
}

From this, I'm trying to write the equivalent .tfvars file (to be used in another module). Something like:

resource "local_file" "file" {
  content  = <<EOF
replication_tasks = "${local.replication_tasks}"
EOF
  filename = "${path.module}/tasks.auto.tfvars"
}

But I get this error:

Cannot include the given value in a string template: string required.

Any suggestion about how to achieve this?

Not sure why you would want to do this, but to generate the desired file you can just serialize the local value:

resource "local_file" "file" {
  content  = <<EOF
replication_tasks =  ${jsonencode(local.replication_tasks)}
EOF
  filename = "${path.module}/tasks.auto.tfvars"
}