Hi and welcome!
Unfortunately Spectre does not have access to your other password manager apps, therefore it isn't trivial for Spectre to import passwords from them into its own store.
Furthermore, it's worth noting that Spectre is not a traditional password manager. Spectre is a stateless password solution: the goal is not to save or store passwords, rather, Spectre generates a new password for each of your sites based on an algorithm that derives it from your cryptographic identity. As a result, Spectre does not store any valuable information on you or your sites and nothing can get stolen or lost in a catastrophic event.
If you choose to use Spectre, you will need to change the passwords of your sites to the one generated by our algorithm, so that your new password becomes immune to data loss.
Although Spectre does support storing passwords in the app through encryption, we recommend you avoid doing this, as these passwords, just like all traditional password manager apps, are vulnerable to data loss and involuntary confiscation.