In dashboard chart 'Group By Based On' custom field not show

i have create this ‘lead owner field’ field which fetched name of lead owner

now i create dashboard chart in the ‘Group By Based On’ in this ‘lead owner Name’ field not show

If the field type is “Link,” it will display correctly. I tested it, and it works properly, but this only applies to the Link field type.

@NCP Understand

Hi @NCP

if i use this field as ‘link’ and when i add lead then give me this error as shown in image
for Administrator user not getting error but when i add lead to another user getting error this

i have check it