[racket] property pict-convertible in typed racket

Hello,

in a personal project I'm working on I've some structure that has to be
printed 'graphically'.
I've used prop:pict-convertible to do this, now I'd like to try to rewrite
the code in typed racket, but it seems that I can't use the #:property
options in typed struct:

The only way I've found to do the same thing was to define the struct in an
untyped module than use require/typed in a typed module.
Is there another way to define  structure that can be printed as a shape?

thanks,
Daniele

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daniele capo
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