The micro entity balance sheet is merely a highly summarised version of the QBOnline Balance Sheet report. You merely need the total fixed assets, total debtors, total creditors (less than 12 months), total creditors (over 12 months), and the net capital.

QBOnline (and to the same extent QB Desktop) do not provide the exact format to meet the FRS105 Micro-Entity accounts formats (as yet), so you will need to perform a manual extraction as described.