rollup-plugin-jsx

This is a simple wrapper around jsx-transform. Make sure to go check that out for options.
Install it with npm install rollup-plugin-jsx
Use it like this in your config:

import jsx from 'rollup-plugin-jsx'

export default {
  dest: 'build/app.js',
  entry: 'src/index.js',
  plugins: [
    jsx( {factory: 'React.createElement'} )
  ],
  sourceMap: true
}

For a more complete example, see buble-react-rollup-starter