Add "Is Freestyle Edge" node and Modifires for Grease pencil based on geometry nodes

Hello, dear developers, I would like the possibilities of processing grease pencil in geometry nodes to be wider in order to achieve results that were not possible in the outdated modifiers for grease pencil. For example, to cover the contours of the grease pencil by selection, and even change those strokes of the grease pencil that need to be changed, and to create procedural modifiers related to the grease pencil based on geometry nodes, like "LineArt", there are not enough nodes like "Is Freestyle Edge", thanks to which you can cover the desired edges with strokes. Thanks to the LineArt modifier, you can cover 3d models with contours not only for an object, collection, or scene, but also for a geometry socket.