The Grouped Product Options extension for Magento 2 allows to enable custom options on the grouped products. By defaults Magento 2 allows to group simple products without options only. But now using the extension you are able to group simple or virtual products with options, configurable and bundle products.
Also your customers will be able to configure custom options of the associated products directly in the grouped product. What is more you can convert the grouped products into a checklist.
Check the Grouped Product Options extension for Magento 2
All our Extensions for Magento 2