It's definitely possible to create Particle shaders with ASE using the
Template Shader feature, which is the ideal solution for custom shader pipeline requirements that take advantage of node-based shader authoring, although some shader knowledge is required.
Templates are just as regular Unity shaders but with special ASE tags placed at key points, be sure to check the
official wiki page for additional information.
The current ASE package includes Particles, UI, Sprites and Image Effects templates that you can use as a starting point to develop your own custom shaders, you can find them at AmplifyShaderEditor \ Examples \ Official \TemplateExamples.