Unfortunately till now , no luck without plugins.
Just updating my answer, here is the plugin JQL Search Extensions for Jira & reports example if interested to use
type = story and subtasksCount < 1
Hi Anh,
JQL Search Extensions is our app and it integrates well with Jira's native search. Feel free to reach out to our support for help. Thanks!
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Hi, @Daniel Turczanski - JQL Search Extensions !
Thank you for the app, it is really useful!👍
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Hi, @Anh Le !
Like told @Muhammad Ramzan(Atlassian Certified Master) this is not possible.
Here you can check all the available JQL features in the Jira Cloud.
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