LyX 2.5, How to set language package options in document settings

In LyX 2.5.0, in the Document Settings window, the user seems to be able to add language package options to the document preamble.

I have set the language package to Custom, but I can't figure out how to add more macros as package options. Left mouse click or right mouse click inside the table like area (annotated in red in the attached screenshot) has no effect.

I read the User Manual, Appendix B (https://wiki.lyx.org/uploads/LyX/Manuals/2.5/en/UserGuide.pdf) but still am not able to figure out.

More specifically, can I insert a command such as
```
\babelprovide[main,import=he,onchar=fonts ids]{hebrew}
```
into the document preamble through the Document Settings window?

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