This should be possible via:
```
#substdef "/MYENVSECRET/$env(AUTH_EPHEMERAL_SECRET)/"
modparam("auth_ephemeral", "secret", "MYENVSECRET")
```
There is another alternative to use command line parameters to set defined values or
substdef rules, see `kamailio -h`.
I am going to close this one, having alternatives for it. If one wants to implement direct
evaluation in modparams, then just do a pull request.
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