Please tell me, is it possible to create your own connectors and is there a need for it at all?
Hi @Andrii_Hromov 
and welcome to our forums!
Absolutely! You can create your own connectors. Here you can find a few examples of connectors developed and maintained by the community.
This guide might help you to orchestrate your services and here you can find some best practices on how to connect Camunda Platform 8 to your systems.
For the full connector experience, you can define custom element templates in the Modeler.
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Many thanks!