You can add a PJSIP trunk in the Web GUI by going to: Connectivity → Trunks → + Add Trunk → + Add SIP (chan_pjsip) Trunk.
The individual settings are set on the pjsip Settings tab.
You should be able to match your settings from your SIP trunk to what PJSIP is asking for. In your example I have no idea what are place holders that you blanked out for security reasons and what are actual settings used by your trunk.
If you are having trouble after that your SIP provider might have some specific instructions for you on how to get a trunk setup that works with their infrastructure.
Generally ITSP provided settings work, but often not well. The failures are often in terms of security, so they don’t affect normal operation. The problem when translating them to chan_pjsip is that you end up trying to find ways to emulate things which weren’t necessary in the first place.