Having a scrum team and calculating with story points I want to be able to define a story point supply for every resource.
Currently JPO only supports the velocity definition for the whole team.

Workaround:

You can adjust weekly hours as a proxy to reflect story points per team member.
The proportion of weekly hours per team member equates to the proportion of story points assigned to members from the pool of team points.

E.g: Team X has 30 pts
Case 1:
Member A - 40 weekly hrs = 10 pts
Member B - 40 weekly hrs = 10 pts
Member C - 40 weekly hrs = 10 pts

Case 2:
Member A - 60 weekly hrs = 15 pts
Member B - 40 weekly hrs = 10 pts
Member C - 20 weekly hrs = 5 pts