Cannot override "meta.helm.sh/release-name" ?

Hello,

We have a system that is able to deploy a PR. The release name is the name of the application + git hash
eg: `helm install my-api-HASH1`
Each PR can be deploy and this allows us to have a full proper e2e before merging.

We also have one single shared namespace for the application. This is a nice way to have all the PRs into one namespace (easy to cleanup if needed), avoid resources pollution but most importantly allows us to for example automatically store secrets into one namespace vs (100 different Namespaces)

However we are facing an issue because Helm automatically adds this annotation:
`meta.helm.sh/release-name={chart's release-name} `

This is causing an issue because it now makes the namespace non unique and we get this if we want to deploy a new PR
`helm install my-api-HASH2`

```
Unable to continue with install: Namespace "mynamespace" in namespace "" exists and cannot be imported into the current release: invalid ownership metadata; annotation validation error: key "meta.helm.sh/release-name" must equal "my-api-HASH2": current value is "my-api-HASH1"
```

We have of course tried this adding this `meta.helm.sh/release-name": "mynamespace"` but this gets ignored by Helm.

Is there a way somehow to override that value ? Is there an other way that would allow us to keep one single namespace for multiple releases ?

UPDATE: Spent some time searching around and I read in the best practices that it was better to not specify the `namespace: ..` field on the resources and let helm handle it.

Indeed, if I remove the `Namespace` resource and remove all the `namespace: ..` field it works only if I passes --`namespace XXX --create-namespace`

However now I'd like to know if there is a way to add custom labels to the namespace Helm is creating?

Thank you!