I'm guessing the answer to this question is no, but no harm asking - tex4ht, when outputting oolatex, outputs an .odt OpenDocument, which is actually a .zip file (which then contains content.xml, folders with images, etc).
However, there is this OpenDocument "Flat XML" file, which gets the extension '.fodt' in Libre/OpenOffice. This one actually even contains encoded binary data of images, within the <office:binary-data> tag! There is a bit on this format in OpenDocument technical specification - Wikipedia, the free encyclopedia.
So, for double-checking what tex4ht outputs in case of oolatex, I guess I'd prefer a direct "render" to a Flat XML .fodt file - instead of bulding the .odt zip, then unzipping it to check its content... But I'm not sure if it's possible at all - I cannot find many references for this Flat XML file format.
Many thanks in advance for any answers,
Cheers!