Hi @kostkond,
Thank you for your patience, and connecting with us on IMX support! 
At this time our team has ImmutableX NFT support on the roadmap, and we can confirm that manual imports are the way to go at this time. We really appreciate you directing others to immutascan.io to export CSV files, and highlighting how to add NFT trades manually. 
To all who want to help expedite the support for IMX integrations, please add your vote to the links below. While I don’t yet have an ETA, by adding your vote you’ll immediately receive a notification once support is ready to go! 
Add support for Immutable X NFT
Starkware Support (L2 network - which is the chain for the following popular platforms: DeversiFi, Immutable X, DYDX)
If anyone has any importing issues, please connect with our support team. We’re keen to help you fly through Koinly!
Have an awesome day!