Elastic Beanstalk: How do I import VPCId from another Cloudformation stack using .ebextensions?

Is it possible to import the value for VPCId from other Cloudformation stacks using Fn:ImportValue in the option_settings in AWS Elastic Beanstalk?

Or do the values have to be hardcoded in at this point? Any pointers would be really appreciated!

This is a working .ebextensions/config, it deploys successfully: For more context, the application is a simple node.js express server and I am deploying the stack using the eb cli

#.ebextensions/vpc.config
option_settings:
  aws:ec2:vpc:
    ELBScheme: internal
    VPCId: vpc-0620a64be983c807a
    Subnets: "subnet-0b2e7f79bdd53a4da,subnet-0f0f6471dc6130f0a,subnet-0ce654446fd42509a"
    ELBSubnets: "subnet-0b2e7f79bdd53a4da,subnet-0f0f6471dc6130f0a,subnet-0ce654446fd42509a"
    AssociatePublicIpAddress: true

This is the broken example with VPCId exported in another cloudformation stack with the value of vpc-0620a64be983c807a:

option_settings:
  aws:ec2:vpc:
    ELBScheme: internal
    VPCId: { "Fn::ImportValue" : "VPCId" }
    Subnets: "subnet-0b2e7f79bdd53a4da,subnet-0f0f6471dc6130f0a,subnet-0ce654446fd42509a"
    ELBSubnets: "subnet-0b2e7f79bdd53a4da,subnet-0f0f6471dc6130f0a,subnet-0ce654446fd42509a"
    AssociatePublicIpAddress: true

This is the error code, it seems like it isn't interpolating the vpcID after the elastic beanstalk bundle has been uploaded to AWS

2021-01-19 10:36:59    ERROR   "option_settings" in one of the configuration files failed validation. More details to follow.
2021-01-19 10:36:59    ERROR   Invalid option value: '["subnet-0ce654446fd425098","subnet-0b2e7f79bdd53a4df","subnet-0f0f6471dc6130f0c"]' (Namespace: 'aws:ec2:vpc', OptionName: 'Subnets'): Specify the VPC ID and make sure all subnets exist.
2021-01-19 10:37:00    ERROR   Invalid option value: 'subnet-0b2e7f79bdd53a4df,subnet-0f0f6471dc6130f0c,subnet-0ce654446fd425098' (Namespace: 'aws:ec2:vpc', OptionName: 'ELBSubnets'): Specify the VPC ID and make sure all subnets exist.
2021-01-19 10:37:00    ERROR   Failed to launch environment.

Update: Backticks and Quotations were suggested, however it seems like it then treats the whole string literally in the VPC lookup

2021-01-19 11:31:05    ERROR   The VPC '`{ "fn::importvalue" :"vpcid" }`' does not exist.