Can learners search the courses based on custom fields like Category or Sub-category?

We have a client using some third party learning platform. On their side courses are grouped under Categories e.g Sales, Finance, Operations etc. The client wants a feature in Oracle LMS wherein the learners are able to search the courses based on these categories. Since this isn't a standard field (it's custom). Is it possible?

If the above approach isn't possible, the next best thing would be for the learners to see a list of all the available courses to search from. The idea is that a new joinee wouldn't be familiar with all the course names so we need to make searching course easy for them . Please advise dear peers.