Use tunnel creds as variables, not in .json file

Hello. Is it possible if I pass tunnel credentials to config.yml, not from file:

credentials-file: /path/your-tunnels-credentials-file.json

but directly, something like

tunnelsecret = "0123"
tunnelid = "1234"

I’m using Docker which runs on Azure Containerapp. Technically, I can reads creds.json file from Azure Storage Account, but it’s not allowed by my company’s policy.