Poiyomi's Shader is a popular Unity based Shader, used in a lot of VR Social Applications.
Using Poiyomi's Shader in Resonite
It is not possible, to use Poiyomi's shader in Resonite. For more information see Custom Shaders.
Emulating Poiyomi's Shader's Look
In most cases it is possible to get very close to Poiyomi's look in Resonite. This is achieved using a combination of Shaders, Settings and in some cases ProtoFlux to achieve a similar look.
The best way to achieve this right now is to ask in our discord, and provide examples of the look you would like. For example by posting screenshots of your avatar on the other platforms.