Hi, Sapana,
Perfect!
I’ve merged your suggestion with the previous one, such as;
[class^="wp-block-"]:not(.wp-block-gallery) figcaption{
font-family:"Helvetica Neue", Helvetica, Arial, sans-serif !important;
color: black;
font-size: 16px !important;
padding: 0 !important;
margin-bottom: 0 !important;
}
It works very well. Gutenberg’s image caption’s font turns to “Helvetica Neue”.
https://chokowalk.sakura.ne.jp/n02/caption-test/
Thank you for your support!