@Hans_Lammerts - yes, since IFC4 there is the capability in the IFC schema to associate a task to a product - which is the result of 4D scheduling, with different possibilities to assign time to a task, and to group tasks in schedules (and have calenders for schedules).
See this small example: https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/link/construction-scheduling-task.htm
Attached is also an old article that explains the concepts behind (plus associating construction costs to tasks, which goes even further).