Here is two ways of exporting your Cameras and other data from Cinema 4D C4D to After effects.
Content Chapters -
00:00 - Introduction
02:24 - Exporting a AEC composition file from CD4
06:08 - Importing a composition file AEC in After effects
11:34 - Use the Cryptomatte data to mask a 3D object in AE
14:20 - Modifying the 3D scene (the camera motion)
16:16 - Re-render the 3D scene
16:55 - Re-importing the composition file to After Effects
21:37 - Syncing 3D after effects objects positions with objects from C4D
30:10 - Importing C4D 3D data directly to After Effects