Some Helm charts make use of urlquery function to encode the value in order to include it in URLs. For example, Harbor helm chart does it with redis password if you pass it in values file for an external redis connection (value redis.external.password).

Using an avp placeholder for redis password results in content like this in generated ConfigMaps:

_REDIS_URL_CORE: >-     redis://:%3Cpath%3Akv%2Fdata%2Fkube%2Fconfig%2Fharbor%2Fredis-pwd%23password%[email protected]/0?idle_timeout_seconds=30
_REDIS_URL_REG: >-     redis://:%3Cpath%3Akv%2Fdata%2Fkube%2Fconfig%2Fharbor%2Fredis-pwd%23password%[email protected]/2?idle_timeout_seconds=30

I know the plugin can recognize base64-encoded placeholders, it isn't hard to make it also recognize url-encoded ones. I'm going to make a pull request for this. Hope this repo will return to life at some point, I use this plugin a lot :)