I worked as a paralegal for one year after graduating and my interview questions were standard competency ones (time-management, successfully prioritising tasks, teamwork, etc) and then some which were more specific to the organisation. I think most firms will understand (especially if you have come from a law degree like I did) that the goal is ultimately to qualify and gain a traineeship somewhere. Many of the paralegals I worked alongside were in the same position. Personally I was not asked about this at interview.
I really enjoyed being a paralegal and feel like it prepared me well / gave me extra confidence for the VS I did. I think it’s good to not just view it as a means to an end but to really make the most of the experience and practical skills you will learn. The firm I have a TC offer at also gave many incoming trainees from my intake paralegal roles for the year between receiving the offer and starting because it makes the transition easier. This isn’t where I worked though.
I can’t speak for every firm but that was my experience