docs(api/kustomizaion-file): migrate field sections

site/content/en/docs/Reference/API/Kustomization File/helmCharts.md

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+---
+title: "helmCharts"
+linkTitle: "helmCharts"
+type: docs
+weight: 8
+description: >
+    Helm chart inflation generator.
+---
+
+[kustomize builtins]: https://kubectl.docs.kubernetes.io/references/kustomize/builtins/#_helmchartinflationgenerator_
+[Helm support long term plan]: https://github.com/kubernetes-sigs/kustomize/issues/4401
+
+## Helm Chart Inflation Generator
+
+Kustomize has limited support for helm chart inflation through the `helmCharts` field.
+You can read a detailed description of this field in the docs about [kustomize builtins].
+
+To enable the helm chart inflation generator, you have to specify the `enable-helm` flag as follows:
+
+```sh
+kustomize build --enable-helm
+```
+
+## Long term support
+
+The helm chart inflation generator in kustomize is intended to be a limited subset of helm features to help with
+getting started with kustomize, and we cannot support the entire helm feature set.
+
+### The current builtin
+For enhancements to the helm chart inflation generator feature, we will only support the following changes:
+
+- bug fixes
+- critical security issues
+- additional fields that are analogous to flags passed to `helm template`, except for flags such as `post-renderer`
+  that allow arbitrary commands to be executed
+
+We will not add support for:
+
+- private repository or registry authentication
+- OCI registries
+- other large features that increase the complexity of the feature and/or have significant security implications
+
+### Future support
+The next iteration of the helm inflation generator will take the form of a KRM function, which will have
+no such restrictions on what types of features we can add and support. You can see more details in
+the [Helm support long term plan].