MiSTercade is popular or there are cheaper alternatives such as the mentioned Aliexpress one or Invzim's (his username here) Jamma-Expander. These options have been around for a few years.
MiSTercade is the best solution for interfacing MiSTer FPGA with a JAMMA arcade cabinet. 0.7ms of input latency, 20W mono audio amplifier, and 3.2V video levels, identical to the Neo-Geo MV1C. Lots of accessories to customize your install, including MiSTercade Remote, button breakouts, and Versus!
misteraddons.com
MiSTer DE10-Nano JAMMA Expander The JAMMA Expander is a PCB that turns your DE10-Nano into a self-contained JAMMA PCB. The DE10-nano used for the MiSTer project has no inputs or outputs that can be used directly with a JAMMA cabinet - which is why you need the Expander. You can access my webshop...
irkenlabs.com
Invzim moved to Malaysia a year ago and is yet to reopen the shop. I have an extra Jamma Exapander that I don't need if you are interested (I bought a quick couple before he closed).
Have a look around for opinions. I have both the above linked kits. The impression I get is that MiSTercade is rich in connectivity and the compact design process was a labour of love. I better understood the price once I received mine.
Whereas the Jamma-Expander is more no-nonsense, simple to setup and has some handy arcade-focused features that can be controlled on the PCB itself with the little switches and OLED screen. User-lock (which blocks UI shortcuts), a switch between keyboard or joystick mapping, and a few UI navigation buttons to avoid plugging a keyboard in when performing updates. It also allows for dual ram.
I personally think MiSTercade has the multipurpose edge if you are going to use the system outside of your cabinet, and Jamma-Expander has the edge if you're going to leave it in. I have no experience with the Aliexpress ones.
The Mistercade2 Arcade that Kingtreelo linked does look very interesting. It integrates the DE10 nano clone with Cyclone FPGA onto a Jamma PCB. It does mean that you're spending on a whole additional Mister system rather than adapting the one you have but at the price that doesn't seem so bad.