Can a custom block persist it’s data as state? (not as html)

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I made a custom Gurtenberg (React) component where an admin can select a “tier”. The problem is that the tier is lost as soon as the admin exits the edit page.

I know you can save data as <div>{attribute.some\_value}</div>, but I need the tier saved as a number so when I make the API call I have that. Is this possible? Should I switch to PHP?