Vault cli issue with secrets containing ':' in their name

Vault
1

I have secrets in vault that can look like this:
{
“ClientCredentials:ClientSecret”: “onesecret”,
“SomeSecret”: “anothersecret”,
}

When i try to get the secrets from vault cli using this kind of config:

auto_auth {
    method  {
        type = "token_file"
        config = {
            token_file_path = ".vault-token"
        }
    }
}
exit_after_auth = false

template { 
    destination = ".vault-output" 
    contents = <<EOH
        {{ with secret "path/to/secrets" }}
        export SECRET_ENV_VARIABLE="{{ .Data.data.ClientCredentials:ClientSecret }}"
        {{ end }}
        EOH
}

It works with .Data.data.SomeSecret but it fails with .Data.data.ClientCredentials:ClientSecret with the following message:
[ERROR] agent.template.server: template server error: error=“(dynamic): parse: template: :2
: expected :=”

I cannot find a way to escape the ‘:’ character…

Any idea please?