Possible to filter certain text lines and file.tags at same time?

[toorukt]

I’m totally new to dataviewjs and typescript (actually not familiar with any code at all) so this probably is a dumb question.
I’ve tried to achieve a dv.table() with certain text lines in a markdown file and also with certain tags (for file tags, not the tag comes with the lines ).
for example,

|filename|lines with background color|#tags|

I’ve found this code:

const files = app.vault.getMarkdownFiles()
let arr = files.map(async(file) => {
  const content = await app.vault.cachedRead(file);
//turn all the content into an array
let lines = await content.split("/n").filter(line => line.includes("background-color: #"))
return ["[["+file.name.split(".")[0]+"]]", lines]
})
Promise.all(arr).then(values => {
console.log(values)
//filter out files without "Happy" and the note with the dataview script
const exists = values.filter(value => value[1][0] && value[0] != "[[exclude]]")
dv.table(["file", "lines"], exists)
})

I think probably I need to add some filter to files = app.vault.getMarkdownFiles() to filter files with certain tags,
or find a way to display the file.tags for the results.
However, I cannot figure out how to do it.
I've ask a same question at obsidian forum but no one answered.
Hoping someone could help me with this!
Or just let me know whether this is possible.
Thanks in advance!