Inserting multiple rows from an object array. UTF-8?

[Walraz]

Getting:
RequestError: The error description is 'An invalid character was found in text content.'
When trying to INSERT 'åäö' chars into my table using multiple rows from an object array asTable.

This one works...
query: "INSERT INTO Table (Char) VALUES (@char)", params: { char: { val: 'ÅÄÖ', type: sql.NVARCHAR } }

This one doesn't work ...
query: "INSERT INTO Table (Id, Char) " + "SELECT @parentId, value FROM @chars", params: { parentId: { val: 123, type: sql.INT }, chars: { val: [ 'å', 'ä', 'ö'], type: sql.NVARCHAR, asTable: true }

And this doesn't work...
query: "INSERT INTO Children (Id, Char) " + "SELECT @parentId, char FROM @chars", params: { parentId: { val: 123, type: sql.INT }, chars: { val: [ { char: 'å' }, { char: 'ä' }, { char: 'ö' } asTable: { char: sql.NVARCHAR, } } }