@Gaurav Thank you for explaining further. If the goal of the feature request is to allow users of Keepass to easily switch to using Bitwarden, then the current import functionality should be sufficient. On the other hand, if by “interoperability”, you are envisioning the possibility of simultaneously using both Keepass and Bitwarden, and frequently synchronizing the vaults used by the two apps, then the current import functionality would probably be too cumbersome.
Perhaps somebody in the Bitwarden contributor community will see value in the request and take it upon themselves to develop import/export support for the .kdbx format. If not, your best bet to achieve interoperability would be to connect with contributors to one of the many Keepass projects and persuade them to implement functionality for exporting vaults in the form of a password-encrypted .json file, which can be imported using the Bitwarden CLI app; the code for creating a Bitwarden-compatible .json file that is encrypted using a user-supplied password is available on Github.
In either case, your goal of transferring vaults between the apps “without hiccup or loss of data” is not likely to come to fruition without major changes to the Bitwarden codebase. This is because Bitwarden currently has no mechanism for importing attachments or item modification dates, both of which may be contained in .kdbx files exported by Keepass.