Environment variable in edge microgateway config yaml

I am using an edge micro gateway as an SSL client with client cert to connect backend API. In edge micro gateway config YAML, I need to hardcode the path of client cert & key. Instead of hard coding the path of cert and key, Is it possible to put the environment variable of location as like below?

Please let me know.

edgemicro:...
targets:- host:'myserver.example.com'
ssl:
client:
key:{$EDGECLIENT}/client.key
cert:{$EDGECA}//ca.crt
passphrase: admin123
rejectUnauthorized:true
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