Anyone may share how to add action icon/image on Appian form interface? So

Please try this example:
a!paragraphField(value:concat(char(9608)," some text goes here"), readOnly:true)

They have used a unicode for doing so. Also the content which you are referring to, is a paragraph component as per my knowledge.

Also one more thing to add is, two components can't be aligned side by side, at times we do overcome this by using two column layout + hidden label for second component + adjacent setting for field label of first component which almost gives user a look and feel that both are side by side.

Please try this example:
a!paragraphField(value:concat(char(9608)," some text goes here"), readOnly:true)

They have used a unicode for doing so. Also the content which you are referring to, is a paragraph component as per my knowledge.

Also one more thing to add is, two components can't be aligned side by side, at times we do overcome this by using two column layout + hidden label for second component + adjacent setting for field label of first component which almost gives user a look and feel that both are side by side.