Use PutResourcePolicy with an Amazon SDK

    def put_resource_policy(
        self,
        log_group_arn: str,
        vpc_endpoint_id: str,
    ) -> dict[str, Any]:
        """
        Creates or updates a resource-scoped policy on a log group that grants
        the syslog.logs.amazonaws.com service principal permission to call
        logs:PutLogEvents and logs:CreateLogStream.

        A resource-scoped policy (one attached to a specific log group) is
        specified with resourceArn and policyDocument. The PutResourcePolicy
        API does not allow policyName to be combined with resourceArn.

        :param log_group_arn: The ARN of the log group (with trailing :*).
        :param vpc_endpoint_id: The VPC endpoint ID to scope the condition.
        :return: The resource policy response.
        """
        policy_document = json.dumps(
            {
                "Version":"2012-10-17",
                "Statement": [
                    {
                        "Sid": "SyslogIngestPermissions",
                        "Effect": "Allow",
                        "Principal": {"Service": "syslog.logs.amazonaws.com"},
                        "Action": [
                            "logs:PutLogEvents",
                            "logs:CreateLogStream",
                        ],
                        "Resource": log_group_arn,
                        "Condition": {
                            "StringEquals": {"aws:sourceVpce": vpc_endpoint_id}
                        },
                    }
                ],
            }
        )
        try:
            response = self.logs_client.put_resource_policy(
                policyDocument=policy_document,
                resourceArn=log_group_arn,
            )
            logger.info("Put resource policy on log group '%s'.", log_group_arn)
            return response
        except ClientError as error:
            logger.error(
                "Failed to put resource policy: %s",
                error.response["Error"]["Message"],
            )
            raise