indent rainbow not working in plaintext

[HangrySensei]

hi, this extension is working on other languages like json, html

however, when it's set to 'plain text', it doesn't work

in settings.json i have include and excluded both set to empty:

// For which languages indent-rainbow should be activated (if empty it means all).
"indentRainbow.includedLanguages": []

// For which languages indent-rainbow should be deactivated (if empty it means none).
"indentRainbow.excludedLanguages": []

please let me know how i can get it work for plaintext?

[DPattee]

Same issue still. Switching to markdown gets it to work, but not all of my text files are markdown...