https://apoorv.blog/optimize-lambda-cost/

payload.json

{
    "lambdaARN": "arn:aws:lambda:us-east-1:123567890:function:lambda-cost-6cvNuq95XpKYZbM6-getTodoFn01C9D3BC-gEAFh9acFv8PunBf",
    "powerValues": [
      128,256,512,1024,2048
    ],
    "num": 10,
    "payload": {
      "body": "{\"id\": \"58dcfe41-cc3f-4f5b-afbf-d69ef4908bae\"}"
    },
    "parallelInvocation": true,
    "strategy": "balanced",
    "balancedWeight": 0.5,
    "autoOptimize": false
}

powerTuning.ts

const powerValues = '128,256,512,1024,2048'

new CfnApplication(this, 'powerTuner', {
  location: {
      applicationId: 'arn:aws:serverlessrepo:us-east-1:451282441545:applications/aws-lambda-power-tuning',
      semanticVersion: '3.4.2'
  },
  parameters: {
      "lambdaResource": "*",
      "PowerValues": powerValues
  },
  timeoutInMinutes: 15
})