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At my shelter, we have a cat enrichment program that is implemented by our volunteers on a daily basis (assuming one is signed up for the day). It coincides with our dog enrichment program (they do both), but the program mainly consists of completing one training where we cover which cats are eligible for enrichment (we don't give additional enrichment to colony cats as they get plenty of stimulation from the public), where to find the enrichment, what the purpose is, etc. There are no prerequisites/tiers required to do the training.
After that, volunteers that have a shift that day will come in and follow the posted enrichment schedule for that day. Our schedule consists of paper bag with treats, hanging toys from top of kennel for them to swat at, feliway, fly by treats, empty easter eggs (they roll around easily! can also include a mild scent in there), and puzzle bowls. We used to do lick mats but the cats were starting to eat them as they would be left in for a while so caution around using lick mats, or recommend just smearing on kennel or a sturdier lick mat situation. Afterwards, the volunteers track the enrichment/whether the cat liked it on a log in the animal's kennel card.
Otherwise, we also have a volunteer opportunity for volunteers to assist with our vet team for intake exams. It's a good chance for them to see how we handle fearful cats in a fear free manner and be able to implement these techniques hands-on. Also, no requisites for this and it's a pretty popular position.