There aren't really any legions of bored researchers waiting for some idea to work on. Moreover, if you do indeed have a promising, sufficiently specific research idea, you'd want to reach the tiny, tiny fraction of people with just the right expertise - no chance for any automated filtering systems here.
The options that are available to you:
a) You seek the relevant guidance to learn how to carry out your research project yourself.
This is what a PhD programme is for. Ideally, you even get a scholarship for this, and then you can spend a couple of years getting paid to learn the skills you want from a specialist in the area.
b) You have plenty of money, and you just want someone to work on the topic you care about.
You can offer a research grant. While most of these come from government organizations, also companies and charities often offer research grants. You would invite researchers to pitch how they'd address your research challenge, and then give money to the most convincing team. Depending on how expensive the research you have in mind is, you may already be getting somewhere good for £100000.
c) You have money to spare, and you want control over the project.
In the grant situation, the researcher would execute the project as they see fit. Alternatively, you could hire a researcher on a consultancy contract and just get their input/contribution to the parts you really need help on.
d) You know your stuff, but you don't have much money to spare
If your situation is such that you can genuinely contribute to the project you have in mind, but that you just cannot do it all alone, you may try and find a collaborator who is also genuinely interested in it. Attend the relevant conference in your field, talk to people. Maybe there is a matching research group at your local institution, and they'd welcome you at their seminars? There isn't really a shortcut here, but hardly anything in the way academics usually start their collaborations with one another is dependent on being affiliated with a university,