Manually editing the alt image attribute

Raw HTML should work, you can also use Commonmark.

![alt text here](upload://Acz6ggl3eq3U1mHPZAIoOcZA3iP.png "title text here")

Resulting HTML is

<img src="https://...image.png" alt="alt text here" title="title text here" width="511" height="500">

You can verify this yourself by pressing the f12 key in your brower and inspecting the rendered HTML, above ↑

Note presence of ALT and TITLE text in the resulting HTML.

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