HDMI output on iMac (Retina 5K, 27-inch, Late 2015)

Hello. Recently I acquired a drawing tablet for my birthday but it requires an HDMI port to connect and I cannot find any official adapters from Apple to connect an iMac that only has Thunderbolt 2 ports to HDMI. All my attempts to search for a Thunderbolt 2 to HDMI have led to products that use newer ports (Thunderbolt 4, USB-C) that my iMac does not have, third party cables and adaptors that may or may not work, or Mini DisplayPort adapters that, as far as I know, do not have functionality with Thunderbolt 2 ports.

Can someone point me in the right direction to what I should do to get an HDMI cable to properly connect to my late 2015 iMac?