During Prince William’s visit, which coincides with World Suicide Prevention Day, he will meet some of Jac’s family and friends, including his father Jesse and teammates from Jac’s football team, Ammanford FC, in Carmarthenshire.
Two of Jac’s friends, Shaun Williams and Rhys Fisher, told BBC Radio Wales Breakfast: “We’ve been practicing our bows.”
“I’m just proud of where we’ve come from, it started in a small town in Wales and now we’re meeting Prince William,” said Mr Fisher.
The prince will also talk to the Welsh Rugby Union and Swansea City about the role of sport within communities and how they can use their platform to influence better mental health among players and fans.
The Jac Lewis Foundation is a charity based in Ammanford, Carmarthenshire, which was set up to provide access to mental health and wellbeing support in communities across Wales.
The organisation aims to ensure that everyone, no matter their age, can access rapid support for mental health and offers other services to help with practical issues relating to housing, finance, training and legal matters.
The new hub in the Principality Stadium is based on the organisation’s existing services which operate at Ammanford FC and Swansea City.
The Royal Foundation’s partnership will enable the hub in Cardiff to operate for one day per week over three years.