SDR to HDR (High Dynamic Range) Converter?
I'd suspect anything purely automated is going to be pretty marginal.  There's a lot of complexity to getting a good curve with the right gamma, but there's a variety of possible levels of what would be considered "good results".  Personally, I'd rather try getting a good mapping manually with something like Resolve and then trying to see what scenes I could copy the curve to.  I'd suspect that minimal effort and reasonable competence would result in a better quality end result than most automated tools.  That's true for most Auto Tone, Auto Level and Auto Curve tools for standard dynamic range, so I'm not sure why it would be different for HDR.