It would be good to have labels declared as constants instead of hard-coded in the Vue component files (similarly to the PHP file ZTypeRegistry.php), so that instead of this.zobject.Z1K1 we can do something like this.zobject[Z_OBJECT_TYPE] and improve readability.
An important point to take into account, as suggested by James, should be to avoid extracting those labels which are only used in one .vue file. In these cases, these can still be declared as constants in the necessary file.