Transmigrated to the Seventies, My Necklace Connects to the Modern Era

Looking for a Story About Traveling Back and Forth Between the Present Day and the 1960s or 1970s

Stories like "In the Sixties, My Backyard Opens onto the Vegetable Market".

Looking for Period Novels With a Passage to the Modern World for Shopping

Looking for Modern or Period Novels Where the Female Lead Can Trade Across Worlds

For example, My Supermarket Connects the Ancient and Modern Worlds.

Looking for Period Stories Where the Protagonist Can Travel Back and Forth Between the Past and Present to Buy Supplies

Ideally set around the founding of the country. The protagonist can travel back and forth between two time periods and help the country buy supplies.