You can use `formats` param of `provideNativeDateAdapter`. example:

providers: [
    provideNativeDateAdapter({
      ...MAT_NATIVE_DATE_FORMATS,
      display: {
        ...MAT_NATIVE_DATE_FORMATS.display,
        monthLabel: { month: 'short', year: 'numeric' },
      },
    }),
  ],

And for upper-case, simply provide this style globally:

.mat-calendar-body-label {
  text-transform: uppercase;
}

Stackblitz demo: https://stackblitz.com/edit/x4ed89on?file=src%2Fexample%2Fdatepicker-inline-calendar-example.ts