Use template in Apprise URL

[DanfieldNet]

Not sure if this is a bug or considered an enhancement. For one of the entries in my config, I'm using mailrise as a SMTP relay to SMTP2Go. The Apprise URL for SMTP2Go is in the form of: smtp2go://{user}@{domain}/{apikey}/{email}

Per the docs, I'm am trying to use the ${from} template to satisfy the URL format but the ${from} is being used as a litteral (not substituted):
smtp2go://${from}/myapistring/me@mydomain

I have verified that the ${from} variable is correct (and in the correct form) by placing it in the body of the message.

Here is log output (email changed):
[2024-04-21 17:38:33] WARNING:apprise:No SMTP2Go username was specified.
[2024-04-21 17:38:33] WARNING:apprise:Could not load Apprise YAML configuration entry #1, item #1
[2024-04-21 17:38:33] WARNING:apprise:Failed to load Apprise configuration from memory://
[2024-04-21 17:38:33] ERROR:apprise:There are no service(s) to notify
[2024-04-21 17:38:34] WARNING:mailrise.skeleton:Notification failed: address: [ [email protected] ➤ [email protected] ] subject: [ RaidAlert-URGENT(192.168.1.14) ] body: [ 2024-04-21 17:38:24 (0.1K) ]

[inselberg]

Same "ERROR:apprise:There are no service(s) to notify " with a basic slack config.