How to configure tests stage in the pipeline to use BatchBuild from Codebuild and create multiple instances about aws-simple-cicd HOT 1 OPEN

const TestsAction = new codepipelineactions.CodeBuildAction({
      actionName: 'Run-Tests',
      outputs: [TestsArtifact],
      input: repoType === 'backend' ? testsDownloadArtifact : buildOutputArtifact,
      project: endToEndTestsProject,
      executeBatchBuild: true,
      combineBatchBuildArtifacts: true
    });

export class RunTestsProject extends codebuild.PipelineProject {
  constructor(scope: cdk.Construct, id: string, props: RunTestsProjectProps) {
    const { testsBucketName, testsBucketArn, targetEnv, repoType, codeCovTokenArn } = props
    super(scope, id, {
      projectName: id,
      role: props.role,
      environment: defaultEnvironment,
      environmentVariables: projectEnvironmentVars({ testsBucketName, testsBucketArn, targetEnv, repoType, codeCovTokenArn }),
      timeout: cdk.Duration.hours(3),
      buildSpec: codebuild.BuildSpec.fromObject({
        version: '0.2',
        batch: {
          'fast-fail': false,
          'build-list': [
            {
              'identifier': 'build_1'
            },
            {
              'identifier': 'build_2'
            }
          ]
        },
        phases: {
          install: {
            'runtime-versions': {
              nodejs: NODE_JS_VERSION
            }
          },
          build: {
            commands: [
              'if [ ! -f "${CODEBUILD_SRC_DIR}/scripts/assume-cross-account-role.env" ]; then echo "assume-cross-account-this.role.env not found in repo" && aws s3 cp s3://${ARTIFACTS_BUCKET_NAME}/admin/cross-account/assume-cross-account-role.env ${CODEBUILD_SRC_DIR}/scripts/; else echo "Overriding assume-cross-account-role.env from repo"; fi',
              '. ${CODEBUILD_SRC_DIR}/scripts/assume-cross-account-role.env',
              'bash ${CODEBUILD_SRC_DIR}/scripts/final-tests.sh'
            ],
          },
        },
        artifacts: {
          files: '**/*'
        },
      })
    });
  }
}

[Container] 2022/09/20 00:17:08 Waiting for agent ping
--
2 | [Container] 2022/09/20 00:17:09 Waiting for DOWNLOAD_SOURCE
3 | [Container] 2022/09/20 00:19:23 Phase is DOWNLOAD_SOURCE
4 | [Container] 2022/09/20 00:19:24 CODEBUILD_SRC_DIR=/codebuild/output/src235984233/src
5 | [Container] 2022/09/20 00:19:24 YAML location is /codebuild/readonly/buildspec.yml
6 | [Container] 2022/09/20 00:19:26 Phase complete: DOWNLOAD_SOURCE State: FAILED
7 | [Container] 2022/09/20 00:19:26 Phase context status code: YAML_FILE_ERROR Message: yaml: unmarshal errors:
8 | line 2: cannot unmarshal !!str `0.2` into float64