https://github.com/k8s-at-home/library-charts/

apiVersion: v2
description: Function library for k8s-at-home charts
home: https://github.com/k8s-at-home/library-charts/tree/main/stable/common

Собственно библиотека - https://github.com/bjw-s/helm-charts/tree/main/charts/library/common Пример чарта (фактически темплейт) - https://github.com/bjw-s/helm-charts/tree/main/charts/other/app-template