add-column.util.ts

// Função
export const addColumn = <T = any>(prop: string) => {
  const shift = prop.split('.').pop();
  return (payload: T): T => {
    
    const column = prop.split('.')
      .reduce((p, c) => payload[p][c]);

    return ({ ...payload, [shift]: column });
  }
}

foo.component.html

<!-- Facilita o search usando DataSource filter -->
<ng-container matColumnDef="name">
  <mat-header-cell *matHeaderCellDef mat-sort-header>Nome</mat-header-cell>
  <mat-cell *matCellDef="let row">
    <span class="text-truncate">{{ row.name }}</span>
  </mat-cell>
</ng-container>

foo.componnent.ts

// Exemplo de uso
this.service
  .findEvaluations()
  .valueChanges()
  .pipe(
    takeUntil(this.destroy$),
    map(d => d.map(addColumn('patient.name')))
  )