import of gitlab issues with csv files is capable of doing all the nice quick actions, which allow you to assign a person and add a label to an issue while importing.

example csv file:

"title";"description"
"Simple Issue";"Simple text"
"Complex Issue";"lorem ipsum

/label ~Todo ~label1 ~label2
/assign @myusername"
"Task Issue";"test the following
- [ ] test1
- [ ] test2
- [ ] test3

/label ~Todo ~label1 ~label2"
"Codeblock Issue";"\`\`\` 
code block line1
code block line2
\`\`\`

/label ~Todo ~label1"

i added a backslash befor the backtick because otherwise dev.to displays the post wrong.

then go to the issue list and use the small button on the top right called "import CSV"