I could not find the way to make mathematic formulas in this series of application, so I used online application that outputs formulas on SVG format.
But this application does not import these files correctly.
Other application: Adobe Illustrator CC / LibreOffice Draw could read this SVG formulas.
I think this issue needs to be fixed.
Attached files would help you:
1. Vector Image: Original formula on SVG format
2. PNG with a little bold formula text: Imported formula displayed on LibreOffice Draw
3. PNG with blue edged formula text: Imported formula displayed on Adobe Illustrator CC
4. PNG with black corner area: Imported formula displayed on Affinity Publisher V2 ( Affinity Designer V2 also had same image. )
Thank you.
original_formula.svg