Mozilla, the developer of Pocket, announced in May 2025 that it was discontinuing the service and would shut it down in July of that year. So Pocket is not in service anymore, this integration request should be deleted. Let's focus on the Readwise integration, as most Pocket users have migrated to Readwise. Thanks!

There already exist (2023) a importing tool using html, csv, enex ir txt files

Check the options at IFTTT, I believe there’s what you are looking for there.