How to make TCPDF checkbox with pipe style?

I tried with style, but not working..

Env: PHP

Now(Default Tcpdf STYLE): https://prnt.sc/utdg8v

I want something like that: https://prnt.sc/utdgwr

I can't use HTML/CSS(or Yes?). Because I have to put it in an existing PDF.

How could I accomplish this?