Welcome to the forums @Makki
I’m fairly sure that you cannot do this.
I haven’t personally tried but the affinity applications only handle ‘static’ 2D images at present.
You can export from a 3D application to an image format which is handled by the Affinity applications – PNG, JPEG, TIFF, etc. – but you will not be able to rotate anything in 3D once that image has been placed into a document.
You can make a feature request in the relevant section of the forums if you wish, but if you need this functionality anytime soon then you might want to look elsewhere.
I am proposing the feature to import 3D models (.fbx, .obj, etc) !
The inclusion of this feature has the following advantages:
1) Unrivalled spectacularity.
2) Dramatically lower RAM usage and produced file size.
3) Endless abilities for in-place model transformation.
IMHO a must-have for every serious DTP software from now on !