If you want something done, do it yourself or hire someone to do it. There is no implicit reason for you to share your desire with the maintainer, unless you have a working agreement with them or would like to initiate one.
If you consider what you want and you think that it clearly aligns with the maintainer’s needs, then consider sharing your ‘want’ along with an explanation of why you think it’s valuable for their needs.
If you can’t figure out what their needs are, and you can’t provide an explanation for why this is important to them, then there’s no reason for you to bring it up to them at all.
(This will seem abrupt, but it’s not meant to be hurtful in any way - I’m just literal and sociology-ish. I did my best to be clear and kind about my view. No harm intended, apologies if any caused.)
If you consider what you want and you think that it clearly aligns with the maintainer’s needs, then consider sharing your ‘want’ along with an explanation of why you think it’s valuable for their needs.
If you can’t figure out what their needs are, and you can’t provide an explanation for why this is important to them, then there’s no reason for you to bring it up to them at all.
(This will seem abrupt, but it’s not meant to be hurtful in any way - I’m just literal and sociology-ish. I did my best to be clear and kind about my view. No harm intended, apologies if any caused.)