How to set up DNS for AWS Elastic Beanstalk on subdomain

I am new to AWS and have got a NodeJS application running on Elastic Beanstalk. The problem is that I need it to be an HTTPS protocol.

My hope is that to resolve this, I can create an SSL certificate in AWS Certificate Manager which I can verify by adding a CNAME record.

After requesting a certificate, AWS has generated a CNAME name and a CNAME value in this format

name: _{hash}.subdomain.domain.app.
value: _{hash}.{id}.acm-validations.aws.

I recognise that I need to remove the trailing periods for squarespace to accept this. But what I am unsure about is whether or not I need to supply the .subdomain.domain.app portion of the name for this record to resolve.

I have currently added multiple records using different format for the name to see if any of them resolve.

Any help with this would be greatly appreciated!

I am also unsure about the setup of a subdomain. In the past (on vercel and netlify) I've just added a record with the following

name: server
value: url to my node server

Does this work the same with Squarespace?