In my cypress test I’m trying to store contents of id_px_file_input-field and then use it a part of cy.contains()

cy.get('[id=id_px_file_input]').then(new_id => {
    const tableID = new_id;
    cy.wrap(tableID).as('tableID');
}); 
cy.contains('Hakemisto').click()
cy.wait(10000)
cy.contains(`U ${'@tableID'} -`).click()
cy.wait(10000)

Where the input looks like this:

<input type="text" name="px_file_input" value="13bu" class="form-control" placeholder="" maxlength="400" disabled="" id="id_px_file_input">

and ’13bu’ is the value I want to store in “variable” tableID.

After clicking “Hakemisto” I want to test that the page contains an element with text U 13bu -

How can I do it ?