Possible but untested. You may be interested to see this recent study that draws a mechanistic link (broadly, microglial inflammation) between the symptoms of long covid and "chemobrain" following chemotherapy [0]. The authors do suggest treatments proposed to restore cognition post-chemotherapy may also be applicable to long covid, e.g. metformin [1].
[0] https://www.cell.com/cell/fulltext/S0092-8674(22)00713-9
[1] https://www.nature.com/articles/s41591-020-0985-2