Can Draw.io Act as a Complete Replacement for Microsoft Visio When Working with DataMiner Visio Templates?
Currently there are no plans to support draw.io natively through DataMiner Visual Overview. Likely your best bet is to find an optimal way to convert draw.io documents to Microsoft Visio ones and then use those. But of course that all depends on your use case as draw.io does not offer shape data, which is essential for linking Visio shapes to their DataMiner object (element, view, service) counterparts.
Draw.io and the other Visio alternatives I've come across do not have support for custom shape data, which is essential to link DataMiner objects to shapes in the drawing. For simple drawings that do not require any link to DataMiner objects, it is possible to export as .vsdx from draw.io and use it in DataMiner, but then you are missing out on most of the functionality visual overview has to offer.