Kotlin DSL 2 field validation in `Configurable`

Hi, I'm writing a plugin that requires configuring a path for a language server. I want to add validation to the settings menu when the user changes the path value.

I have tried many things without success. The way I managed to do it is to imperatively change attributes of a predefined label depending on a validation function that runs with `onApply`

    private val gleamPathSelect = GleamPathSelect()

    private fun runPathValidation() {
        if (!gleamPathSelect.isEnabled) return

        LOG.warn("Running path validation")

        val path = gleamPathSelect.text
        val valid = FsUtils.validateGleamPath(path)
        if (!valid) {
            errorLabel.foreground = JBColor.RED
            errorLabel.text = "Invalid path"
        } else {
            errorLabel.foreground = JBColor.GREEN
            errorLabel.text = "Valid path"
        }
    }
    /* ... */
    override fun Panel.createContent() {
            row(GleamBundle.message("gleam.settings.lsp.configurable.lsp.path")) {
            	/* private val gleamPathSelect = GleamPathSelect() */
                cell(gleamPathSelect)
                    .align(AlignX.FILL)
//                    .errorOnApply("Gleam path is invalid") { true }
                    .onApply { runPathValidation() }
                    .bindText(settings::lspPath)
            }

I would like to hook into the existing validation system, but I cannot seem to make it work. I looked at the Kotlin DSL UI demo source code but the validation section only covers live input validation. I have tried with apply, but even then ideally I would prefer to do the validation whenever the value has changed, in a debounced fashion.

Can someone give me some guidance?