"the interested" is not a proper part of a sentence in English.
It is an adjective phrase that needs to be followed by a noun to make a complete thought. For example, "the interested parties" or "the interested individuals." You can use "the interested" when you want to describe a specific group of people who have an interest in something. For example, "The meeting was attended by the interested investors" or "The conference was open to the interested public."
Dictionary
the interested
noun
The price paid for obtaining, or price received for providing, money or goods in a credit transaction, calculated as a fraction of the amount or value of what was borrowed.
Exact(60)
The interested parties have not been identified.
(He refused to name the interested party).
We have been in conversations with all the interested parties.
Concerns about the replacements vary depending on the interested parties.
Perrin starts to exhibit his skill before the interested neighbors.
NBC is believed to be one of the interested companies.
They even rang the interested person to discuss it.
It also made both of the interested parties feel good.
A click whisked the interested reader to Yahoo Finance.
The interested reader will consult [16].
We leave this to the interested reader.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com