Can't create ADPCM data block

[Galstaff]

I apologize in advance what am I'm asking if this is a well known problem, but I couldn’t find anything through search. I captured an .s98 stream that contains ym2608 adpcm samples and then converted it to .vgm. However, the .s98->.vgm conversion tool didn't detect any adpcm sample data, even though I can clearly see valid adpcm write sequence in the resulting .vgm. The problem is that I can’t use this .vgm on my hardware as-is because it requires going through some hoops when uploading adpcm data, so I really need a proper data block in the .vgm. I haven’t been able to find any tools that make can this block. Any advice?