Modern.js Module uses esbuild to build toolkits and component libraries, and Rsbuild focuses on solving web application building scenarios.
Modern.js Module is based on esbuild for building and cannot use tools from the webpack-related ecosystem. You can find more community plugins for esbuild here
If the UMD product produced by Modern.js Module does not meet your requirements, you can use Rsbuild and add UMD Plugin to build UMD products.