XF 2.2 iframe link embed map?



I have map created on a website that I want to embed into my forum posts. The map website offers an iframe link to the map:

<iframe width="768" height="576" src="https://maphub.net/embed/109684?panel=1&panel_closed=1" frameborder="0"></iframe>

Can someone please explain to me how I can get the above link to work within a post on our forum so that the map is embedded into a post? I think custom BB code is needed, but have no idea how to make it work?

Thank you, please!
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