The phrase "the jailed" is correct and usable in written English.
It can be used to refer to individuals who are currently imprisoned or incarcerated.
Example: "The jailed individuals were granted a hearing to appeal their sentences."
Alternatives: "the imprisoned" or "the incarcerated".
Dictionary
the jailed
verb
To imprison.
Exact(59)
It's obvious that jail isn't good for the jailed.
Yet Robinson was not asked directly about the jailed Islamists.
"One day justice will be done and the jailer will replace the jailed".
All three of the jailed journalists work for outlets sympathetic to Rouhani's administration.
Even the most hawkish know the jailed will be out in time.There are other reasons for hope.
The Norwegian committee just awarded its 2010 Nobel Peace Prize to Liu Xiaobo, the jailed Chinese pro-democracy activist.
In February 2013, Milliyet printed the minutes of talks between Kurdish politicians and the jailed Kurdish rebel leader Abdullah Ocalan.
The president had promised during his election campaign to make the jailed medics a priority of his foreign policy.
Mrs. Clinton's husband, after all, held the power to pardon or reduce the sentences of the jailed men.
Who are the jailed journalists?
Captain Zaharie Shah was a supporter of the jailed politician.
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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