Currently a member of a team can be a friend, a casual player, a player/coach or a coach (see dedicated article). They may also be a team administrator (see the dedicated article).
We are thinking about adding more roles, or adding a column other than the "sports role" column, indicating the position of the person in the club (president, treasurer, officer, secretary ...). We will keep you updated on developments
Until we change this, you can add a column from the team roster management page (Action icon "Edit Columns"): you can, for example, add the column "position in the club "and put what you want.