How to use the serverless environment variable in stepfunction parameter - aws-serverless

Question

I have a query with hardcoded dates used in the parameters section.Instead I want to pass them as environment variables.Any suggestions on how to parameterize the QueryString parameter?
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:
callAthena:
name: datasorting-dev
type: STANDARD
role: ${self:custom.datasorting.${self:provider.stage}.iam}
definition:
Comment: "Data Refersh"
StartAt: Refresh Data
States:
Refresh Data:
Type: Task
Resource: arn:aws:states:::athena:startQueryExecution.sync
Parameters:
QueryString: >-
ALTER TABLE table.raw_data ADD IF NOT EXISTS
PARTITION (YEAR=2021, MONTH=02, DAY=15, hour=00)
WorkGroup: primary
ResultConfiguration:
OutputLocation: s3://output/location
End: true

Answer 1

you can replace any value in your serverless.yml enclosed in ${} brackets,
Serverless Framework Guide to Variables:
https://www.serverless.com/framework/docs/providers/aws/guide/variables/
for example, you can create a custom: section looking for environment variables, and if they are not present, you can have default values:
service: service-name
frameworkVersion: '2'
custom:
year: ${env:YEAR, 'default-year'}
month: ${env:MONTH, 'default-month'}
day: ${env:DAY, 'default-day'}
hour: ${env:HOUR, 'default-hour'}
stepFunctions:
stateMachines:
callAthena:
...
Parameters:
QueryString: >-
ALTER TABLE table.raw_data ADD IF NOT EXISTS
PARTITION (YEAR=${self:custom.year}, MONTH=${self:custom.month}, DAY=${self:custom.day}, hour=${self:custom.hour})
...