Welcome to the Airtable community!
Because you want to use the value from one row/record in another row/record, you cannot use a formula field.
Here are some possibilities:
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if the value in the rich text field will never change, you can use a no-code automation to update the field. Place the value that you want to use directly in the automation.
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if the value in the rich text field of the “first row” changes, and you always want the most recent value, you can use a scripting automation. The scripting automation would look up the current value and then update the trigger record.
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If you do not want to use an automation, you could also use a button field that triggers a script.