InDesign won't support mathml.
You can use external editor like mathtype for this workflow.
Other plugins are powermath, inmath etc., but it won't support mathml (I think so...), those plugins have it's own codings.
Vandy88 is correct -- InDesign doesn't support MathML, but MathType does, and you can use MathType with MathML. However, I don't want to cloud the issue or introduce confusion -- using MathType with InDesign means you'll insert the equations into the document as EPS, not as MathML. Even if you use MathType to process the MathML, the MathML equations still aren't recognizable by InDesign, and they'll need to be in graphical format.
Unless you're tied to InDesign, there are some really nice XML+MathML solutions available in the marketplace, but this probably isn't the right forum to discuss that.
How are you doing?
You said about some solutions using XML+MathML.
Thank you so much.
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I'm your fan.
I've seen this plugin before.
Have you seen this one by Scand?
In a test that I did works fine with JS but I am not sure if works both PC and Mac.
Let me know if you have new options about MathML.
I didn't know Scand's system. They mention 'MathML Kit has no internal visual editor for formulas, but you might use your favorite from Links panel as usual' suggests that the equations are placed files.
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Probably you could say SCAND's plugin lacks built-in editor but it imports .mathml files in automated mode (following a script). Moreover it be customized by your request. So you've a bunch of equations to be implemented in Adobe InDesign and got no time it could help you.
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BTW a new version is going for release in a couple of days, it would support Adobe CS 2019 as well. )