Hello All
Here is my post on placing custom column using Grid Table inside Smart Table/ Object Page in List Report Object page (LROP).
1. Smart Table with grid table having custom column:

Output:

2. Object Page of LROP with grid table having custom column:
Define the table type in
manifest.json:

Add a custom column to object page from project extensions.

Add
GridTableColumnsExtension under the view extension in manifest file as below.

ItemGridTableColumnColumns.fragment.xml

Output:

Additionally, we can get horizontal scrollbar in both the approaches if we are having more columns in the table.
Thank you!!
BR// Dhanasupriya Sidagam
#EnhanceLearning