Thank you for your feedback. There are no plans to add functionality to K2 Cloud for natively importing Excel data into a SmartObject. However, if the community-based broker is rewritten to use the new JavaScript Service Provider type, then it can be used in K2 Cloud.
You can do this via Power Automate and the Smartobject API
Other low/no code platforms support this natively. It's not terribly difficult...the code even exists already in the community broker! Just do it!
This is a big one we miss too. We have to use PowerAutomate. It's a shame that we have to cannibalise the toolset and give an odd user experience.