For the Kria the UART is already built in. This is the nearest I could find that you might find helpful.
See the last sentence under 'Introduction' for the above project.
Some others simple projects using Kria to get started:
The Kria KV260 Vision AI Starter Kit is great for embedded vision applications and AI acceleration. Several of my clients, however, have expressed an interest in the SOM for applications outside of vision applications and AI or where vision / AI only forms a small part of the overall...
www.adiuvoengineering.com
Temporary repo to gather information about the Kria KV260 board - tomverbeure/kv260_bringup
https://zaza-casino.bet/
See the project from
www.adiuvoengineering.com. You can use a similar concept to build your own UART, use same Pmod port, and just use two pins of it, one for UART rx and the other for UART tx . Connect it externally using a simple wire, and you can snd out UART data and receive them on the board.
The Kria is really meant for experienced developers for heavy duty tasks. Probably that is why you do not have a Hello World example design using UART communication anywhere on the internet.
If you are an experienced engineer, you should be able to figure out yourself how to use the Kria to deploy your design using the examples available on the internet. If you are a young professional in this domain, this is NOT the best board to begin with!