There's a number of solutions. One is to use a maintained Helm Library Chart that exposes all the values most could ever want like The Helmet [1]. The other is to move over to something like Timoni that is analogous to Helm but with better templating [2].

[1] https://github.com/companyinfo/helm-charts/tree/main/charts/...

[2] https://timoni.sh/comparison/