Sadly no. Making charts accessible is an unsolved problem. There have been some efforts for accessible graphing calculators that work more or less, but it's not trivial to make a generic one-size-fits-all solution.
For Sheets, the underlying stuff that runs it is quite complicated. They ended up doing something akin to an offscreen model with HTML to make it work because afaik they use a canvas of some sort to draw everything. In fact, unless you turn on braille mode, both products actually have a built-in screen reader that talks via aria live regions. That's terrible practice, but to their credit they got ahead of what the internet was providing for accessibility and didn't have a choice in that regard.
For something you can practically implement without a huge project, I suggest text descriptions of the data. If you want to do a bit better, make it an HTML table--that'll give some convenient navigability for free.
For Sheets, the underlying stuff that runs it is quite complicated. They ended up doing something akin to an offscreen model with HTML to make it work because afaik they use a canvas of some sort to draw everything. In fact, unless you turn on braille mode, both products actually have a built-in screen reader that talks via aria live regions. That's terrible practice, but to their credit they got ahead of what the internet was providing for accessibility and didn't have a choice in that regard.
For something you can practically implement without a huge project, I suggest text descriptions of the data. If you want to do a bit better, make it an HTML table--that'll give some convenient navigability for free.