How to add saved passwords from other platforms to your iPhone

How can I sync login information saved to other applications, browsers, and/or platforms/OS’s to the passwords list saved and synced in my iPhone, iPad, and MacBook? For example, chrome browser has instruction on how to import user names and passwords from other browsers… I’m pretty sure Edge offers a solution for transferring/saving bill amounts of user login data as well.

I currently go back and forth between my iPhone, Samsung s22 ultra, iPad, Samsung Galaxy S7 plus tablet, MacBook, and a windows laptop, and Id like to transfer specific information and data from my other devices and browsers to my apple products - but I don’t want to transfer everything and fill up my apple devices with a bunch of junk data I don’t want or need anymore… and id really just like to get all of my user login info saved to one place, being my iPhone/iCloud account… I have hundreds if not thousands of passwords and logins… Is there a way to easily transfer all of the login info automatically? Or would I need to manually create new entries for every single separate password and username one by one and then delete them from the previous device/account/platform?

If there’s not a way to automatically import them, it’s there at least a way to enter them all into a csv file and upload mass amounts of login info that way?

can anyone please help me out here? :-)

thanks so much

Ali