You can, BUT the mascot itself is not that of Jollibee's property anymore - it'll be outsorced or in short third party. As far as I can remember, when one of the tenants in our building had a Jollibee kids' party, a mascot who's a outsource came and stayed for like 30mins. They said that the client pays directly to Jollibee for the mascot appearance and the resto itself will deduct a certain amount before they pay the talent (mascot).
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To add on, just be sure that the venue is good enough to carry Jollibee's reputation. Like they can't be seen in areas that are hmm so-so. Like basket court/ gymnasiums turned to party venues. Clubhouses will do.