How to Insert a Custom Float

[Doug Martin]

Stoyan Stoyanov and I have a paper accepted by a Journal that does not use
Figures or Tables,
and instead uses Exhibits for both.  Stoyan points out the following:

We can load the newfloat package and define a custom Exhibit float
environment trivially in the preamble in this way:

\usepackage{newfloat}
\DeclareFloatingEnvironment{exhibit}

Then, in latex one use it the usual way:
\begin{exhibit}
...
\end{exhibit}

Although we can include those two lines in the preamble in LyX, the menu in
Inset -> Float does not have a "custom" option.
How can we insert a custom float in LyX?

Any guidance that anyone can provide would be very much appreciated.

Doug Martin
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