How to modify the tag value in Content fragment model json output

[BigT168]

Using AEM 6.3 core version 2.

Like content fragment model and model.json output.

However, my tag definition is mytag:prod/shoe, mytag:prod/shirt.

In the json output, instead the tag value mytag:prod/shoe, I would like to get only shoe without name space and parent's folder.

and I also have to know if this is a tag, where to get the metaType=tags?

Does anyone know how I can accomplish this?

Thanks.