First of all, do not use ActiveX. It is very old technology not supported anywhere except IE (pretty sure) so bad choice. IE, I think, is on the chopping block soon so it is dead as a browser.
3D pie chart is bad: 2 things (3d and pie) combined so poor choice of communicating percentages: See here: https://depictdatastudio.com/when-pie-charts-are-okay-seriously-guidelines-for-using-pie-and-donut-charts/
The question then becomes what to use in your Access form. I suggest using a png and just embed the image, if that is the question.
However, I think you asking how to solve an issue that should not exist. Ultimately, what are you trying to do? Provide some data dropdowns. let a user choose, then return a graph? If so, ActiveX is the wrong tech.
Sorry to be a downer but do not use ActiveX, 3D graphs, VBA. That puts you back to what and how. Give us more details and we help craft a directional solution.
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