Hi Marvin,
I'm not exactly sure what you mean here. If you are trying to use the iOS Password AutoFill feature, you simply follow the instructions in this help article: https://support.msecure.com/en/support/solutions/articles/36000085078-ios-password-autofill
If you are wanting to move your mSecure data to iCloud Keychain, which is a question I have never heard before, that is not possible. You could try checking both the "iCloud Passwords & Keychain" and "mSecure" options in the Password AutoFill options screen which may allow you to save the data mSecure auto-fills into iCloud Keychain.
More importantly, what is it you're trying to do here? If you simply need to have your mSecure data auto-filled into account login pages in Safari, turning on the iOS Password AutoFill feature for mSecure will fulfill your needs.
Marvin
How can I export mSecure to iCloud Keychain?