Ask HN: HN – open-source front end for Workflow editor?

I'm starting a side project that can be characterized as a workflow tool (i.e., customer onboarding email drip campaign manager).

I'm a backend developer and have a good sense on how that will work but I'm not a frontend developer and am at a loss on how would I create the WYSIWYG workflow editor.

There's lots of frontend frameworks (React/Bootstrap/etc) but I can't seem to find one that is an generic frontend workflow editor.

In case a visual helps, here’s a screenshot of the front end for a leading workflow management offering.

https://customer.io/wp-content/uploads/2021/06/use-case-onboarding.svg