CloudFormation template to create S3 bucket resource with custom role

aws-template-bucket-custom-acl.yaml

AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31

Parameters:
  BucketPrefix:
    Type: String
    Description: "The prefix used for all S3 buckets."
    AllowedPattern: "[a-z-]+"

Resources:
  Assets:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Sub "${BucketPrefix}-assets"
        
  CustomRole:
    Type: "AWS::IAM::Role"
    Properties:
      RoleName: !Sub "${AWS::StackName}-CustomRole"
      Path: /

      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - # add your own statement here

      Policies:
        - 
          PolicyName: !Sub "${AWS::StackName}-CustomRole"
          PolicyDocument:
            Statement:
              - 
                Effect: Allow
                Action:
                  - s3:PutObject
                  - s3:GetObject
                  - s3:PutObjectTagging
                Resource:
                  - !Join ["", ["arn:aws:s3:::", Ref: "BucketPrefix", "-assets", "/*" ]]