Can use Step definition outside Feature file?

This may be a dumb question coming from someone who does not have BDD background. So, basically I want to use “Step definitions” defined in under “Include > scripts > groovy” into my Test cases/scenarios mapped via an Excel sheet. I don’t want to use it for Feature files. Is this possible?

The background of the request is that it would be difficult to request our UAT testers to use feature files. Instead, they would want a set of pre-defined steps and use it to create their own test cases using Excel sheet.
Instead of calling “LogIn_to_enviroment”, they will just enter “Login to environment” using an Excel sheet and map it against a Katalon test case.

I know this can be achieved by defining the steps via “Keywords” but I felt that Step definitions would be more suitable.