Hi Vasco,
I assume that we could export entity to Excel but it seems that currently we are not able to import data from Excel to entity.
To export entity from an entity to Excel, you may consider using the trigger “When a record is created”.
Then use the action “Excel – Insert row”. You should have an Excel table placed on OneDrive or other cloud storage account.
The flow could be configured likes below. Then when a new record is created in entity, it will be also created in Excel.
Please try if this will meet your needs.

About ongoing import from Excel to entity, please consider creating a request at Flow ideas Forum. I will help collect and report it on my side.
https://powerusers.microsoft.com/t5/Flow-Ideas/idb-p/FlowIdeas
Best regards,
Mabel Mao