That’s what the error directive Resume allows you to do. First, you use a Search module to see if it exists, then Create a new item if it doesn’t exist. In the Create field, you use an if-statement to “ignore” a required field if there are search results, throwing an error and allowing you to “skip” the creation module.
Here, in this example, I’m using Notion, but you can apply the same concept to any integration that has a Search module.
The if (not-exist-create-ignore) throws the error (ignore if exists), which the Resume directive can be used to return the item from the Search module (to check if it exists).
I explained this in a similar older post Can I skip a module based on a filter? - #3 by samliew, Skipping a step/module - #8 by samliew