I have always thought it would be useful if API providers were able to provide the javascript bundle that Zapier runs under the hood on the dev platform alongside their API at a pre-defined route, so any runner (Zapier, Tray, MS Flow/Power Automate) could consume the API regardless of location (SaaS automation, desktop client, etc). I believe there's even an automation provider that allows you to "one-click" import the integration you've built from Zapier to their platform (the name escapes me at the moment, my apologies).
If the API provider is already maintaining the integration, it's a matter of automation providers moving towards a standard for how to express integrations as the ecosystem matures.
If the API provider is already maintaining the integration, it's a matter of automation providers moving towards a standard for how to express integrations as the ecosystem matures.