Hi @RS ,
Currently, there is no easy way to implement image picker in modern list column. SPFX for list view command set using pnp file controls is the only way for modern list. Otherwise, you need to convert list to classic experience.
The same question has been discussed here: https://sharepoint.stackexchange.com/questions/284690/how-to-add-an-image-picker-to-a-modern-list-in-sharepoint-online
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