UI field to display calculated value

I need to display a calculated value, that look like any other readonly Data field.
On form’s refresh, I call backend method to get the calculated value.
I do not need to save this value in the doctype’s database table.

I could use a Data docfield, but then it creates an useless column in the database. Moreover, when I call frm.set_value() it triggers dirty() on the form.

I could use an HTML docfield, but then I need to duplicate a load of html to replicate the look of a Data field (label and input).

Any other suggestions ?
Thanks!

This is what you are looking for Virtual DocField

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