Do you mean you would like to show password custom field into user profile page?

If yes, Easysocial already have this password custom field, you can check my attached screenshot below.

If you are not referring this, can you elaborate more details regarding this?

Actually I would like to set a password field in an app settings.
(config/user.json)

Currently we do not have any password field available for this section, perhaps you can refer on one of the example here how we create text or textarea field in an app settings.

JoomlaFolder/administrator/components/com_easysocial/themes/default/forms/types/text.php
JoomlaFolder/administrator/components/com_easysocial/themes/default/forms/types/textarea.php

Once you create a password.php file, in config/user,.json file you can call this type :

"type" : "password"

Yes Arlex,

Thanks a lot, this is exactly what I needed.
I duplicated text.php, renamed it to password.php
replaced

type="text"

by

type="password"

and this now appears like a password field.

Would you consider adding it to a future update or do I need to ask my customers to create it ?

You're welcome.

Currently we do not have render any password field into app setting frontend, perhaps you can ask your customer to add this password.php into their site.