The source for Net::SSH is available for viewing online here. Although not noted in the documentation, it looks like you could do something like this:

use Net::SSH qw(ssh);

push( @Net::SSH::ssh_options, "-v" );
push( @Net::SSH::ssh_options, "-F" );
push( @Net::SSH::ssh_options, "./ssh_proxy.cfg" );

ssh('beng1@xxx.xxx.xxx.xxx', $command);
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