How to use the @aws-cdk/aws-iam.CfnInstanceProfile function in @aws-cdk/aws-iam

this.securityGroup = new ec2.SecurityGroup(this, 'InstanceSecurityGroup', {
      vpc: props.vpc,
      allowAllOutbound: props.allowAllOutbound !== false
    });
    this.connections = new ec2.Connections({ securityGroups: [this.securityGroup] });
    this.securityGroups.push(this.securityGroup);
    this.node.applyAspect(new Tag(NAME_TAG, this.node.path));

    this.role = props.role || new iam.Role(this, 'InstanceRole', {
      roleName: PhysicalName.GENERATE_IF_NEEDED,
      assumedBy: new iam.ServicePrincipal('ec2.amazonaws.com')
    });

    this.grantPrincipal = this.role;

    const iamProfile = new iam.CfnInstanceProfile(this, 'InstanceProfile', {
      roles: [ this.role.roleName ]
    });

    // use delayed evaluation
    const imageConfig = props.machineImage.getImage(this);
    this.userData = props.userData || imageConfig.userData || ec2.UserData.forOperatingSystem(imageConfig.osType);
    const userDataToken = Lazy.stringValue({ produce: () => Fn.base64(this.userData.render()) });
    const securityGroupsToken = Lazy.listValue({ produce: () => this.securityGroups.map(sg => sg.securityGroupId) });

    const launchConfig = new CfnLaunchConfiguration(this, 'LaunchConfig', {
      imageId: imageConfig.imageId,
      keyName: props.keyName,
      instanceType: props.instanceType.toString(),
      securityGroups: securityGroupsToken,
      iamInstanceProfile: iamProfile.ref,
      userData: userDataToken,