I hope that you will find what you are looking for, and maybe the following could be a starting point for you:
Speech bubbles in Krita have occasionally been a topic here in the forum.
The easiest way to do this will probably be to use Inkscape. I think the topics mentioned below could be a start, an introduction to the topic of symbol libraries, you will be able to discover more information with the forum search accessible via the magnifying glass symbol at the top right of the forum pages. There are now also (a few) symbol libraries with speech bubbles for use in Krita, to be found in the resources section of the forum, there is also a plugin that can be a good help with simple speech bubbles, Rogudator’s Speech Bubble Generator, another plugin, New Inkscape 1.3 plugin: Ink Sync, which is supposed to couple Krita with Inkscape and be a help with text, but I don’t know anything about its capabilities, there is also:
For further questions on the topic, it is best to create your own topics in the support area (for me: “The green sector”) found on the homepage of the forum.
Hello @Umbrellafighter, and welcome to the forum!