Show warning number in playground

[nojaf]

Would be nice to see the warning number in the tab on the playground:

https://rescript-lang.org/try?version=v12.0.0-beta.6&module=esmodule&code=C4TwDgpgBBB2DGB7ArrYEBOUC8UDeAUFFADaLwCGwAlorAPoUYQUBcUTGFIAPEcfn4CosCgFsI7AM7AM1WAHMANEIHIMJabPnLVAXxXEAfIagA3TFNoMAJhGAVqJKe07c+wwsOJwkqdBj0dg5OLhwYXLx48AAWFAiSUPLAeiaqxBYYVnTsXt7EohJacoqm+eqaUDIluvkG+qZpekA

In this case, I want to ignore that error but have no clue what to put in my config.