Your claim for maintenance will be considered only when you apply for it invoking the proper provisions of law meant for it with an application.
Your reply or counter to heis petition may contain your desire for maintenance but since it is not an application for maintenance, the court may not entertain your claim for maintenance just because you have made a mention about it in your reply/counter to his main petition.
You may have to file the affidavit for declaring your assets only when you make a claim for maintenance invoking the provisions of section 24 HMA, by filing a separate application for this purpose.