How to insert help symbol (?) above a custom type for help in Jira cloud?

[Sam]

In custom types I need to insert ( ? symbol inside a circle) above a certain custom type. 

[Gabriel Senna]

Hi Garikipati,

For us to better help you, I'm going to need additional information.

Could you please clarify "custom types"?

Do you want to add a symbol or a button above custom field?

With this information, I should be able to better help you.

[Sam]

Exactly I need a button above a custom type with (?) as Help button.