Convert Apple Mail MBOX to PDF for Long-Term Storage & Sharing

I have been using Apple Mail for years, and I have accumulated a large number of emails stored in MBOX files. I want to archive these emails in a more accessible and shareable format, preferably PDF, so I can easily access them in the future and also share specific emails with colleagues when needed. I have tried a few free methods, but they either take too long or do not preserve the email formatting properly.