AWS IAM Role "inline_policy.0.policy" contains an invalid JSON policy using $(file xyz) and jsonencode

Terraform Providers AWS
1

With only the assume role policy, it works. If I remove the inline the policy, it all validates. When left in, (it looks like this.) It does not validate.

resource "aws_iam_role" "test_role" {
  name   = "my_test_role"
  assume_role_policy = jsonencode("${file("..//Policies//policy_assume_role.json")}")
  inline_policy {
    name = "inline_s3_policy"
    policy = jsonencode("${file("..//Policies//policy_s3_bucket.json")}")
  }
}

Then my policy_s3_bucket.json looks like this

  
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": ["s3:ListBucket"],
      "Resource": ["arn:aws:s3:::company-terragrunt-terraform-state-123456789-us-east-1"]
    },
    {
      "Effect": "Allow",
      "Action": ["s3:GetObject"],
      "Resource": ["arn:aws:s3:::company-terragrunt-terraform-state-123456789-us-east-1/*"]
    }
  ]
}

I get - ““inline_policy.0.policy” contains an invalid JSON policy” … but the JSON is valid. My configured user does have access to those buckets. Also, the assume role policy is working without the s3 inline in there. The assume role policy json looks to be the same format, and I’m pulling it in the same fashion.