Create _CDS API service with ABAP coding.

Hello,
i person a task for instauration of a caller OData API.
I would similar to usage a elemental CDS presumption with @odata.publish: true
and to reuse an existing customized logic which has been written successful ABAP.
Is that attack imaginable astatine all?

*details:
When the work is generated determination is customizing created which referes to a Data Provider Class : CL_SADL_GTK_EXPOSURE_DPC. However one tin not find a mode to alteration this customization and to acceptable up a caller Z people present and moreover the class CL_SADL_GTK_EXPOSURE_DPC is simply a last class.

Maybe the lone anticipation is to reuse this caller CDS successful SEGW ?

Thanks,
Rosen