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Using a unique selector (like the one in your image) invoke https://docs.cypress.io/api/commands/invoke the element text and store it with an alias https://docs.cypress.io/guides/core-concepts/variables-and-aliases i.e.
`cy.get('.reveal-private-key etc').invoke('text').as('privateKey')`

And later in your test re use it:
```cy.get('@privateKey').then($elText => {
     cy.log('$elText', $elText)
})```