Yes! If you are using or planning to use PWA studio or any PWA framework then We are supporting read GraphQL query. Example, { products(filter: {sku: {eq: '24-MB01' }}) { items { __typename id name ...
Module style file is located at app/code/Magediary/AccessoryUpsell/view/frontend/web/css/source/_module.less If you want to change the style, then override the _module.less file here: ...
Yes, all selected items will be listed out on the frontend product view page. The customer can choose as many items as they want by selecting multiple checkboxes.
You can import accessory items using the Magento native way like import related, upsell and cross-sell products. Please check how to export/import items in our below demo video.