serverless step functions: Getting error when passing more than one fields in the payload for lambda - aws-serverless

Question

Error: Invalid State Machine Definition: 'SCHEMA_VALIDATION_FAILED: The value for the field 'Date.$' must be a valid JSONPath at /States/Insert Data Dynamodb/Parameters' (Service: AWSStepFunctions; Status Code: 400; Error Code: InvalidDefinition;
below is the corresponding serverless.yaml code.
I tried wrapping the two parameters into encoded json string and passed it as single payload field and it resulted in the same error but when there is only one plain field in the payload this code deployed successfully
Any suggestions on how to pass two parameters?
service: service-name
frameworkVersion: '2'
provider:
name: aws
runtime: go1.x
lambdaHashingVersion: 20201221
stage: ${opt:stage, self:custom.defaultStage}
region: us-east-1
tags: ${self:custom.tagsObject}
logRetentionInDays: 1
timeout: 10
deploymentBucket: lambda-repository
memorySize: 128
tracing:
lambda: true
plugins:
- serverless-step-functions
configValidationMode: error
stepFunctions:
stateMachines:
sortData:
name: datasorting-dev
type: STANDARD
role: ${self:custom.datasorting.${self:provider.stage}.iam}
definition:
Comment: "Data Sort"
StartAt: Query Data
States:
Query Data:
Type: Task
Resource: arn:aws:states:::athena:startQueryExecution.sync
Parameters:
QueryString: >-
select * from table.data
WorkGroup: primary
ResultConfiguration:
OutputLocation: s3://output/location
Next: Insert Data Dynamodb
Insert Data Dynamodb:
Type: Task
Resource: arn:aws:states:::lambda:invoke
Parameters:
FunctionName: arn:aws:lambda:us-east-1:${account-id}:function:name
Payload:
OutputLocation.$: $.QueryExecution.ResultConfiguration.OutputLocation
Date.$: ${self:custom.dates.year}${self:custom.dates.month}${self:custom.dates.day}
End: true

Answer 1

Your Date.$ property has value of ${self:custom.dates.year}${self:custom.dates.month}${self:custom.dates.day}. Let's assume that:
const dates = {
"year": "2000",
"month": "01",
"day": "20"
}
The result will be Date.$: "20000120" which is not a valid JSON Path.
JSON Path needs to start with a $ sign and each level is divided by ..
Do you want to achieve something like this? $.2000.01.20?
As you see, the issue is not with passing 2 parameters but with wrong string JSON Path created by string interpolation for Date.$.
Some useful links:
https://github.com/json-path/JsonPath
https://docs.aws.amazon.com/step-functions/latest/dg/amazon-states-language-paths.html