You can't be serious; I can't stand having to guess what kind of crazy markup is required to express things in toml. As a concrete example I converted my local kubeconfig (which is yaml) and here are the completely random characters indicating some kind of hierarchy
apiVersion = "v1"
current-context = ""
kind = "Config"
[[clusters]]
name = "my-cluster"
[clusters.cluster]
certificate-authority-data = "LS0tL..."
server = "https://example.com"
[[contexts]]
name = "context0"
[contexts.context]
cluster = "my-cluster"
user = "my-user"
[[contexts]]
name = "context1"
[contexts.context]
cluster = "my-cluster"
user = "my-user"
[[users]]
name = "my-user"
[users.user]
[users.user.exec]
apiVersion = "client.authentication.k8s.io/v1beta1"
args = ["eks", "get-token"]
command = "aws"
As the other person who replied to you noted, a converted-from-yaml file wherein the service is designed to use yaml, not toml, it hardly a good example of toml. Of course your example is bad.
It is really just arrays of objects/dicts that get complicated with TOML. For dictionary properties not inside an array, you can either fully specify the path `foor.bar.baz = 7`, or use a header like `[foo.bar]` and specify `baz=7`.
Also if I was handwriting that I would probably make more use of doted property names implying dictionaries like so, which though it has a little bit more repetition in property names, seems easier to read:
If k8s was designed with TOML in mind, it probably have been structured differently, such that "Contexts" for example might be just a dictionary mapping names to an object that has the values from the "context" property (The existing pattern of an array of objects where each object has a name, but store most of their properties in a property whose name matches the object's type is already weird, but doesn't look terrible in yaml.)
Such a redesigned to be a more TOML friendly schema would then look like this: