Because of the "rollup-plugin-dotenv" isn't being update all that much, so I use "@rollup/replace" and "dotenv" in conjunction.

rollupReadEnvFile.js

const replace = require('@rollup/plugin-replace');

const envKeys = () => {
    const envRaw = require('dotenv').config().parsed || {};

    return Object.keys(envRaw).reduce(
        (envValues, envValue) => ({ ...envValues, [`process.env.${envValue}`]: JSON.stringify(envRaw[envValue]) }),
        {}
    );
};

formats.map(format => ({
    plugins: [
        ...somePlugins,
        replace(envKeys()),
    ]
})