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not sure if you mean what Mercedes-Benz has built as a self service. Their use case is on the web site.

So basically they shown today a UI example, where the user can create a resource from there.

My goal is to facilitate infrastructure provisioning for my developers.

This is what i was referring to. So did you mean some thing that Pulumi natively does with a UI to deploy resources to help your app developers ? [Selfishly / Promoting], we have a No/Low code solution that does exactly what i think you may be  looking for. Ping me and i can share more details.

<https://www.pulumi.com/case-studies/mercedes-benz/>