Is it possible to use this outside of EKS? about secrets-store-csi-driver-provider-aws

[Elentary]

Yes, however it is not officially documented.
You shoud have working IAM role association for service accounts in your self-hosted cluster via AWS IAM OIDC (or similar approach like kube2iam, but I haven't tested it).
Then you should:

1. Set driverWritesSecrets launch argument to True (currently not possible via Helm, but I am already on it)
2. Create IAM role with permissions to sts:AssumeRoleWithWebIdentity (see the Medium article above) and secretsmanager:GetSecretValue.
3. Add "eks.amazonaws.com/role-arn" annotation to the service account you will use later for your pod. Use ARN of the role from step 2 as the value.
4. Add AWS_DEFAULT_REGION, AWS_ROLE_ARN, AWS_WEB_IDENTITY_TOKEN_FILE envs to your pod (also see Medium article above :)
5. Now configure volumes, volume mounts and SecretProviderClass as you would in EKS (see guide in this repo)

Do you think detailed article about using this project in self-hosted k8s would be useful ?

[roberto-sebastiano]

Same here, I run k3s on prem and I would like to use AWS secrets manager.
Is this possible with this project ?

[roberto-sebastiano]

Absolutely, I think so