I think it would be helping individual players improve their technical ability. According to Google AI, this is the description...
An individual development coach in soccer is a specialized staff member dedicated to creating and executing customized improvement plans for players at various levels, from youth academies to professional first teams. They bridge the gap between team-wide tactical goals and a player's personal needs, focusing on technical skills, decision-making, and psychological growth. By analyzing data, video, and performance, they provide targeted mentorship to ensure players thrive within the team's broader system.