Helm Chart - Merge two values with different structure

My question is similar to this question Helm Charts with multiple lists in multiple values files however, the change is that the value structure is different and I need a way to merge those

the chart has the following

 env:
   {{- toYaml .Values.env | nindent 12 }}

the default values.yaml file has the following

env:
  - name: Test
    value: "Value"

The custom.yaml file has the values defined as

env:
  - name: Test2
    value: "Value2"

Based on this post Helm Charts with multiple lists in multiple values files, I am able to merge these two into a single by modifying the chart to

 env:
    {{- range $key, $value := .Values.abc.env }}
    - name: {{ $key }}
      value: {{ $value | quote }}
    {{- end }}  

However, this doesn't work if the default value file has a key/value that has a different format.

My requirement is that I need to insert the worker node IP into all the pod as an environment name HOST_IP. Any additional env variables in the custom.yaml must be added to this.

env:
  - name: HOST_IP
    valueFrom:
      fieldRef:
        apiVersion: v1
        fieldPath: status.hostIP

So, the final yaml must have

env:
  - name: HOST_IP
    valueFrom:
      fieldRef:
        apiVersion: v1
        fieldPath: status.hostIP
  - name: Test2
    value: "Value2"

The issue here is that when these are merged, it provides an incorrect syntax.

How can I have these two formats merged into a single so that I can add them to the template? Is there a way to merge these in helm?