Create a Deep Link to Open a Journey in HCM

We have a requirement to create a deeplink to place in a third party system, that would route the employee to HCM to complete some required paperwork/electronic signature tasks in a Journey in order to purchase specific safety gear that is required for work. We found the list of delivered deep links, but we don't see where we can create or add a deep link to the list.

Is it possible to create a deep link to launch a specific journey for the employee when clicked?

Thanks,

Jennifer