Tool for verification availability of GUI elements before running automated tests (Katalon Studio and Groovy)

1) Implementation of a tool that verifies the availability of GUI elements of a sample Web page (proposed language - Groovy). 2) GUI object selectors and test cases are run in Katalon Studio and the tool is to verify the availability of objects in advance according to saved selectors (e.g. CSS and Xpath). 3) Information should be visible whether the object is available or not available. 4) The tool can be launched in the console, integrated with Katalon Studio. 5) The tool must be presented on an example page where the GUI elements do not change, and on other pages where the GUI elements will not be available as a result, e.g. - dynamic id's, object classes, - problem with JavaScript scripts on the page (e.g. the application sees other values ​​than those resulting from the script), - badly written front in HTML, - the object appears too late after the action has been carried out.