I am setting the following environment variable in Helm Deployment like so.

name: SERVER_ENDPOINT
value: {{ .Values.server.dev_proxy_endpoint }}

But would like to interpolate the environment part (dev) of the value variable, like so

name: SERVER_ENDPOINT
value: {{ .Values.server. {{ .Values.environment | lower }} _proxy_endpoint }}

Is this possible?

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I tried that out by creating a new definition at the top of the file like so:

{{- $value_path_to_endpoint := print ".Values.server." .Values.environment  "_proxy_endpoint" -}}

But that then presents a literal value, rather than the context pointer to the values file.

name: SERVER_ENDPOINT
value: {{ $value_path_to_endpoint}}

In other words, $value_path_to_endpoint returns:

".Values.server.dev_proxy_endpoint"

Rather than

.Values.server.dev_proxy_endpoint