See the discussion going on at eclipse-wildwebdeveloper/wildwebdeveloper#474, from eclipse-wildwebdeveloper/wildwebdeveloper#474 (comment) onwards

Currently LSP4E seems to read formatting settings like 'insert tabs for spaces' from the global preference store. Projects like https://github.com/angelozerr/ec4e however allow customizing such settings on a project by project basis and offers more settings, like trim_trailing_whitespace and insert_final_newline.

It would make the dev experience so much better if the settings from .editorconfig, applied to the editor preference store by ec4e, would get picked up by LSP4E for the FormattingOptions for documentFormatting, rangeFormatting and onTypeFormatting commands