Using fresh with latex

[Fortunatus77]

First of all, I wanted to say "thank you" for this wonderful editor. For me it is like dream come true!
I have a question about Latex. Is it possible to setup search from .pdf in okular to .tex file in fresh and back? I have texlab LSP installed, and texlab wiki (https://github.com/latex-lsp/texlab/wiki/Previewing) says that the following text should be inserted in editor's config:
{
"texlab.forwardSearch.executable": "okular",
"texlab.forwardSearch.args": ["--unique", "file:%p#src:%l%f"]
}

However, when I just put this my .config/fresh/config.json , it throws error message. I suspect I am not using the correct syntax for this, could somebody give me advice how to do it (if it is possible)?