Use own/custom field inside Craft Table I made my own, fairly simple field inside a Module for Craft 3.x.

What settings do i need to define to make it usable inside a table?
I think you just can't: allowed field types seem to be hardcoded in craft\fields\Table::getSettingsHtml().
See https://github.com/craftcms/cms/blob/develop/src/fields/Table.php#L215 for details.
You might create a CustomTable field that inherits the Table class and overrides its getSettingsHtml() methods to allow you custom field type, but that seems overkill. It may be easier to just use a matrix field instead of a table field.